Royal intermarriage is the practice of members of ruling dynasties marrying into other reigning families. It was more commonly done in the past as part of strategic diplomacy for national interest. Although sometimes enforced by legal requirement on persons of royal birth, more often it has been a matter of political policy or tradition in monarchies.
In Europe, the practice was most prevalent from the medieval era until the outbreak of World War I, but evidence of intermarriage between royal dynasties in other parts of the world can be found as far back as the Late Bronze Age. Monarchs were often in pursuit of national and international aggrandisement on behalf of themselves and their dynasties, thus bonds of kinship tended to promote or restrain aggression. Marriage between dynasties could serve to initiate, reinforce or guarantee peace between nations. Alternatively, kinship by marriage could secure an alliance between two dynasties which sought to reduce the sense of threat from or to initiate aggression against the realm of a third dynasty. It could also enhance the prospect of territorial acquisition for a dynasty by procuring legal claim to a foreign throne, or portions of its realm (e.g., colonies), through inheritance from an heiress whenever a monarch failed to leave an undisputed male heir.
In parts of Europe, royalty continued to regularly marry into the families of their greatest vassals as late as the 16th century. More recently, they have tended to marry internationally. In other parts of the world royal intermarriage was less prevalent and the number of instances varied over time, depending on the culture and foreign policy of the era.
It was not until the study of genetics began in the early twentieth century that the harm caused by inbreeding was recognized. For modern observers, it is easy to see its relation to royal biological problems, most noticeably in the case of the last Spanish Habsburg monarch, Charles II of Spain, incapable of procreation and suffering from a pronounced underbite – the Habsburg jaw.
While the contemporary Western ideal sees marriage as a unique bond between two people who are in love, families in which heredity is central to power or inheritance (such as royal families) have often seen marriage in a different light. There are often political or other non-romantic functions that must be served and the relative wealth and power of the potential spouses may be considered. Marriage for political, economic, or diplomatic reasons, the marriage of state, was a pattern seen for centuries among European rulers.
At times, marriage between members of the same dynasty has been common in Central Africa.
In West Africa, the sons and daughters of Yoruba kings were traditionally given in marriage to their fellow royals as a matter of dynastic policy. Sometimes these marriages would involve members of other tribes. Erinwinde of Benin, for example, was taken as a wife by the Oba Oranyan of Oyo during his time as governor of Benin. Their son Eweka went on to found the dynasty that ruled the Kingdom of Benin.
Marriages between the Swazi, Zulu and Thembu royal houses of southern Africa are common. For example, the daughter of South African president and Thembu royal Nelson Mandela, Zenani Mandela, married Prince Thumbumuzi Dlamini, a brother of Mswati III, King of Swaziland. Elsewhere in the region, Princess Semane Khama of the Bamangwato tribe of Botswana married Kgosi Lebone Edward Molotlegi of the Bafokeng tribe of South Africa.
Examples of historical, mythical and contemporary royal intermarriages throughout Africa include:
- Princess Mantfombi Dlamini, sister of Mswati III of Swaziland, and Goodwill Zwelithini, King of the Zulus, as his chief queen consort 
- The Toucouleur emperor Umar Tall and Princess Maryem, the daughter of Sultan Muhammed Bello of Sokoto
- Chief Nfundu Bolulengwe Mtirara of the Thembu people, a great-nephew of Nelson Mandela, and Princess Nandi of Zululand, a daughter of King Goodwill Zwelithini.
- Fadlallah, son of Shehu Rabih az-Zubayr of Borno, and Khadija, a daughter of Sheik Mohammed al-Mahdi al-Sanusi of the Senoussi people.
- Princess Owawejokun, a daughter of the Owa Atakumosa of Ijeshaland, and Ogoro, the Ajapada of Akure.
- Oranyan, the Alaafin of Oyo, and Torosi, a princess of the Nupe people.
The Chakri Dynasty of Thailand has included marriages between royal relatives, but marriages between dynasties and foreigners, including foreign royals, are rare. This is in part due to Section 11 of 1924 Palace Law of Succession which excludes members of the royal family from the line of succession if they marry a non-Thai national.
The late king Bhumibol Adulyadej was a first-cousin once removed of his wife, Sirikit, the two being, respectively, a grandson and a great-granddaughter of Chulalongkorn. Chulalongkorn married a number of his half-sisters, including Savang Vadhana and Sunandha Kumariratana; all shared the same father, Mongkut.
The Lý dynasty which ruled Dai Viet (Vietnam) married its princesses off to regional rivals to establish alliances with them. One of these marriages was between a Lý empress regnant (Lý Chiêu Hoàng) and a member of the Chinese Trần (Chen) clan (Trần Thái Tông), which enabled the Trần to then topple the Lý and established their own Trần dynasty.
A Lý princess also married into the Hồ family, which was also of Chinese origin and later established the Hồ dynasty which also took power after having a Tran princess marry one of their members, Hồ Quý Ly.
The Cambodian King Chey Chettha II married the Vietnamese Nguyễn lord Princess Nguyễn Thị Ngọc Vạn, a daughter of Lord Nguyễn Phúc Nguyên, in 1618. In return, the king granted the Vietnamese the right to establish settlements in Mô Xoài (now Bà Rịa), in the region of Prey Nokor—which they colloquially referred to as Sài Gòn, and which later became Ho Chi Minh City.
Marriage policy in imperial China differed from dynasty to dynasty. Several dynasties practiced Heqin, which involved marrying off princesses to other royal families.
The Xiongnu practiced marriage alliances with Han dynasty officers and officials who defected to their side. The older sister of the Chanyu (the Xiongnu ruler) was married to the Xiongnu General Zhao Xin, the Marquis of Xi who was serving the Han dynasty. The daughter of the Chanyu was married to the Han Chinese General Li Ling after he surrendered and defected. The Yenisei Kirghiz Khagans claimed descent from Li Ling. Another Han Chinese General who defected to the Xiongnu was Li Guangli who also married a daughter of the Chanyu.
The Xianbei Tuoba royal family of Northern Wei started to arrange for Han Chinese elites to marry daughters of the royal family in the 480s. Some Han Chinese exiled royalty fled from southern China and defected to the Xianbei. Several daughters of the Xianbei Emperor Xiaowen of Northern Wei were married to Han Chinese elites, the Han Chinese Liu Song royal Liu Hui 劉輝, married Princess Lanling 蘭陵公主 of the Northern Wei, Princess Huayang 華陽公主 to Sima Fei 司馬朏, a descendant of Jin dynasty (265–420) royalty, Princess Jinan 濟南公主 to Lu Daoqian 盧道虔, Princess Nanyang 南陽長公主 to Xiao Baoyin 蕭寶夤, a member of Southern Qi royalty. Emperor Xiaozhuang of Northern Wei's sister the Shouyang Princess was wedded to The Liang dynasty ruler Emperor Wu of Liang's son Xiao Zong 蕭綜.
When the Eastern Jin dynasty ended Northern Wei received the Jin prince Sima Chuzhi 司馬楚之 as a refugee. A Northern Wei Princess married Sima Chuzhi, giving birth to Sima Jinlong 司馬金龍. Northern Liang King Juqu Mujian's daughter married Sima Jinlong.
The Kingdom of Gaochang was made out of Han Chinese colonists and ruled by the Han Chinese Qu family which originated from Gansu. Jincheng commandery 金城 (Lanzhou), district of Yuzhong 榆中 was the home of the Qu Jia. The Qu family was linked by marriage alliances to the Turks, with a Turk being the grandmother of King Qu Boya.
Tang dynasty (618–907) emperors gave princesses in marriage to rulers of the Uyghur Khaganate to consolidate the special trade and military relationship that developed after the Khaganate supported the Chinese during the An Lushan Rebellion. At least three Tang imperial princesses are known to have married khagans between 758 and 821. These unions temporarily stopped in 788, which is believed in part to be because stability within the Chinese empire meant that they were politically unnecessary; however, threats from Tibet in the west, and a renewed need for Uyghur support, precipitated the marriage of Princess Taihe to Bilge Khagan.
The ethnically Chinese Cao family ruling Guiyi Circuit established marriage alliances with the Uighurs of the Ganzhou Kingdom, with both the Cao rulers marrying Uighur princesses and with Cao princesses marrying Uighur rulers. The Ganzhou Uighur Khagan's daughter was married to Cao Yijin in 916.
The Chinese Cao family ruling Guiyi Circuit established marriage alliances with the Saka Kingdom of Khotan, with both the Cao rulers marrying Khotanese princesses and with Cao princesses marrying Khotanese rulers. A Khotanese princess who was the daughter of the King of Khotan married Cao Yanlu.
The Khitan Liao dynasty arranged for women from the Khitan royal consort Xiao clan to marry members of the Han Chinese Han 韓 clan, which originated in Jizhou 冀州 before being abducted by the Khitan and becoming part of the Han Chinese elite of the Liao.
Han Chinese Geng family intermarried with the Khitan and the Han 韓 clan provided two of their women as wives to Geng Yanyi and the second one was the mother of Geng Zhixin. Empress Rende's sister, a member of the Xiao clan, was the mother of Han Chinese General Geng Yanyi.
Han Durang (Yelu Longyun) was the father of Queen dowager of State Chen, who was the wife of General Geng Yanyi and buried with him in his tomb in Zhaoyang in Liaoning. His wife was also known as "Madame Han". The Geng's tomb is located in Liaoning at Guyingzi in Chaoying.
Emperors of the proceeding Song dynasty (960–1279) tended to marry from within their own borders. Tang emperors, mainly took their wives from high-ranking bureaucratic families, but the Song dynasty did not consider rank important when it came to selecting their consorts. It has been estimated that only a quarter of Song consorts were from such families, with the rest being from lower status backgrounds. For example, Liu, consort of Emperor Zhenzong, had been a street performer and consort Miao, wife of Emperor Renzong was the daughter of his own wet nurse.
During the Qing dynasty (1644–1912), emperors chose their consorts primarily from one of the eight Banner families, administrative divisions that divide all native Manchu families. To maintain the ethnic purity of the ruling dynasty, after the Kangxi Period (1662–1722), emperors and princes were forbidden to marry non-Manchu wives. Imperial daughters however were not covered by this ban, and as with their preceding dynasties, were often married to Mongol princes to gain political or military support, especially in the early years of the Qing dynasty; three of the nine daughters of Emperor Nurhaci and twelve of Emperor Hongtaiji's daughters were married to Mongol Princes.
The Manchu Imperial Aisin Gioro clan practiced marriage alliances with Han Chinese Ming Generals and Mongol princes. Aisin Gioro women were married to Han Chinese Generals who defected to the Manchu side during the Manchu conquest of China. The Manchu leader Nurhaci married one of his granddaughters to the Ming General Li Yongfang 李永芳 after he surrendered Fushun in Liaoning to the Manchu in 1618 and a mass marriage of Han Chinese officers and officials to Manchu women numbering 1,000 couples was arranged by Prince Yoto 岳托 (Prince Keqin) and Hongtaiji in 1632 to promote harmony between the two ethnic groups. Aisin Gioro women were married to the sons of the Han Chinese Generals Sun Sike (Sun Ssu-k'o) 孫思克, Geng Jimao (Keng Chi-mao), Shang Kexi (Shang K'o-hsi), and Wu Sangui (Wu San-kuei).
Nurhaci's son Abatai's daughter was married to Li Yongfang. The offspring of Li received the "Third Class Viscount" (三等子爵; sān děng zǐjué) title. Li Yongfang was the great great great grandfather of Li Shiyao 李侍堯.
The "Dolo efu" 和碩額駙 rank was given to husbands of Qing princesses. Geng Zhongming, a Han bannerman, was awarded the title of Prince Jingnan, and his son Geng Jingmao managed to have both his sons Geng Jingzhong and Geng Zhaozhong 耿昭忠 become court attendants under the Shunzhi Emperor and married Aisin Gioro women, with Prince Abatai's granddaughter marrying Geng Zhaozhong 耿昭忠 and Haoge's (a son of Hong Taiji) daughter marrying Geng Jingzhong. A daughter 和硕柔嘉公主 of the Manchu Aisin Gioro Prince Yolo 岳樂 (Prince An) was wedded to Geng Juzhong 耿聚忠 who was another son of Geng Jingmao.
The Silla Kingdom had a practice that limited the succession to the throne to members of the seonggol, or "sacred bone", rank. To maintain their "sacred bone" rank, members of this caste often intermarried with one another in the same fashion that European royals intermarried to maintain a "pure" royal pedigree.
The Goryeo Dynasty had a history of incestuous marriage within the royal family in its early years, starting from Gwangjong, the fourth king, who married his half-sister Queen Daemok. To avoid scandals, the female members of the dynasty would be ceremonially adopted by their maternal families after birth. This practice of dynastic incest ended with the overthrow of Queen Heonae, the mother of Mokjong, the seventh king, after she attempted to seize the throne for herself and her illegitimate sons by placing these sons as Mokjong's heir, only to be foiled by a coup masterminded by the Goryeo general Gang Jo.
After the Second Manchu invasion of Korea, Joseon Korea was forced to give several of their royal princesses as concubines to the Qing Manchu regent Prince Dorgon. In 1650, Dorgon married the Korean Princess Uisun (義順). She was a collateral branch of the Korean royal family, and daughter of Yi Gae-yun (李愷胤). Dorgon married two Korean princesses at Lianshan.
The Japanese may not have seen intermarriage between them and the royal dynasties of the Korean Empire damaging to their prestige either. According to the Shoku Nihongi, an imperially commissioned record of Japanese history completed in 797, Emperor Kanmu who ruled from 781 to 806 was the son of a Korean concubine, Takano no Niigasa, who was descended from King Muryeong of Baekje, one of the Three Kingdoms of Korea.
In 1920, Crown Prince Yi Un of Korea married Princess Masako of Nashimoto and, in May 1931, Yi Geon, grandson of Gojong of Korea, was married to Matsudaira Yosiko, a cousin of Princess Masako. The Japanese saw these marriages as a way to secure their colonial rule of Korea and introduce Japanese blood in to the Korean royal House of Yi.
Medieval and Early Modern Europe
Careful selection of a spouse was important to maintain the royal status of a family: depending on the law of the land in question, if a prince or king was to marry a commoner who had no royal blood, even if the first-born was acknowledged as a son of a sovereign, he might not be able to claim any of the royal status of his father.
Traditionally, many factors were important in arranging royal marriages. One such factor was the amount of territory that the other royal family governed or controlled. Another, related factor was the stability of the control exerted over that territory: when there was territorial instability in a royal family, other royalty would be less inclined to marry into that family. Another factor was political alliance: marriage was an important way to bind together royal families and their countries during peace and war and could justify many important political decisions.
The increase in royal intermarriage often meant that lands passed into the hands of foreign houses, when the nearest heir was the son of a native dynasty and a foreign royal.[n 1][n 2] The Habsburgs, for example, expanded their influence through arranged marriages and by gaining political privileges in what would become Switzerland, and in the 13th century the house aimed its marriage policy at families in Upper Alsace and Swabia. Given the success of the Habsburgs' territorial acquisition-via-inheritance policy, a motto came to be associated with their dynasty: Bella gerant alii, tu, felix Austria, nube! ("Let others wage war. You, happy Austria, marry!")
Monarchs sometimes went to great lengths to prevent this. On her marriage to Louis XIV of France, Maria Theresa, daughter of Philip IV of Spain, was forced to renounce her claim to the Spanish throne. When monarchs or heirs apparent wed other monarchs or heirs, special agreements, sometimes in the form of treaties, were negotiated to determine inheritance rights. The marriage contract of Philip II of Spain and Mary I of England, for example, stipulated that the maternal possessions, as well as Burgundy and the Low Countries, were to pass to any future children of the couple, whereas the remaining paternal possessions (including Spain, Naples, Sicily, Milan) would first of all go to Philip's son Don Carlos, from his previous marriage to Maria Manuela of Portugal. If Carlos were to die without any descendants, only then would they pass to the children of his second marriage. On the other hand, the Franco-Scottish treaty that arranged the 1558 marriage of Mary, Queen of Scots and Francis, the son and heir of Henry II of France, had it that if the queen died without descendants, Scotland would fall to the throne of France.
Religion has always been closely tied to European political affairs, and as such it played an important role during marriage negotiations. The 1572 wedding in Paris of the French princess Margaret of Valois to the leader of France's Huguenots, Henry III of Navarre, was ostensibly arranged to effect a rapprochement between the nation's Catholics and Protestants, but proved a ruse for the St. Bartholomew's Day massacre. After the English Reformation, matches between English monarchs and Roman Catholic princesses were often unpopular, especially so when the prospective queen consort was unwilling to convert, or at least practice her faith discreetly.[n 3] Passage of the Act of Settlement 1701 disinherited any heir to the throne who married a Catholic. Other ruling houses, such as the Romanovs[n 4] and Habsburgs, have at times also insisted on dynastic marriages only being contracted with people of a certain faith or those willing to convert. When in 1926 Astrid of Sweden married Leopold III of Belgium, it was agreed that her children would be raised as Catholics but she was not required to give up Lutheranism, although she chose to convert in 1930. Some potential matches were abandoned due to irreconcilable religious differences. For example, plans for the marriage of the Catholic Władysław IV Vasa and the Lutheran Elisabeth of Bohemia, Princess Palatine proved unpopular with Poland's largely Catholic nobility and were quietly dropped.
Marriages among ruling dynasties and their subjects have at times been common, with such alliances as that of Edward the Confessor, King of England with Edith of Wessex and Władysław II Jagiełło, King of Poland with Elizabeth Granowska being far from unheard of in medieval Europe. However, as dynasties approached absolutism and sought to preserve loyalty among competing members of the nobility, most eventually distanced themselves from kinship ties to local nobles by marrying abroad. Marriages with subjects brought the king back down to the level of those he ruled, often stimulating the ambition of his consort's family and evoking jealousy—or disdain—from the nobility. The notion that monarchs should marry into the dynasties of other monarchs to end or prevent war was, at first, a policy driven by pragmatism. During the era of absolutism, this practice contributed to the notion that it was socially, as well as politically, disadvantageous for members of ruling families to intermarry with their subjects and pass over the opportunity for marriage into a foreign dynasty.
While Roman emperors almost always married wives who were also Roman citizens, the ruling families of the empire's client kingdoms in the Near East and North Africa often contracted marriages with other royal houses to consolidate their position. These marriages were often contracted with the approval, or even at the behest, of the Roman emperors themselves. Rome thought that such marriages promoted stability among their client states and prevented petty local wars that would disturb the Pax Romana. Glaphyra of Cappadocia was known to have contracted three such royal intermarriages: with Juba II&I, King of Numidia and Mauretania, Alexander of Judea and Herod Archelaus, Ethnarch of Samaria.
Other examples from the Ancient Roman era include:
- Polemon II, King of Pontus and Berenice of Judea
- Aristobulus IV of Judea and Berenice of Judea
- Aristobulus Minor of Judea and Iotapa of Emesa
Though some emperors, such as Justin I and Justinian I, took low-born wives,[n 5] dynastic intermarriages in imperial families were not unusual in the Byzantine Empire. Following the fall of Constantinople in 1204, the ruling families, the Laskarides and then the Palaiologoi, thought it prudent to marry into foreign dynasties. One early example is the marriage of John Doukas Vatatzes with Constance, the daughter of Emperor Frederick II of the Holy Roman Empire to seal their alliance. After establishing an alliance with the Mongols in 1263, Michael VIII Palaiologos married two of his daughters to Mongol khans to cement their agreement: his daughter Euphrosyne Palaiologina was married to Nogai Khan of the Golden Horde, and his daughter Maria Palaiologina, was married to Abaqa Khan of the Ilkhanate. Later in the century, Andronikos II Palaiologos agreed marital alliances with Ghazan of the Ilkhanate and Toqta and Uzbeg of the Golden Horde, which were quickly followed by weddings with his daughters.
The Grand Komnenoi of the Empire of Trebizond were famed for marrying their daughters to their neighbours as acts of diplomacy.[n 6] Theodora Megale Komnene, daughter of John IV, was married to Uzun Hassan, lord of the Aq Qoyunlu, to seal an alliance between the Empire and the so-called White Sheep. Although the alliance failed to save Trebizond from its eventual defeat, and despite being a devout Christian in a Muslim state, Theodora did manage to exercise a pervasive influence both in the domestic and foreign actions of her husband.
Though usually made to strengthen the position of the empire, there are examples of interdynastic marriages destabilising the emperor's authority. When Emperor Andronikos II Palaiologos married his second wife, Eirene of Montferrat, in 1284 she caused a division in the Empire over her demand that her own sons share in imperial territory with, Michael, his son from his first marriage. She resorted to leaving Constantinople, the capital of the Byzantine Empire, and setting up her own court in the second city of the Empire, Thessalonica.
Post World War I era
In modern times, among European royalty at least, marriages between royal dynasties have become much rarer than they once were. This happens to avoid inbreeding, since many royal families share common ancestors, and therefore share much of the genetic pool. Members of Europe's dynasties increasingly married members of titled noble families, including George VI of the United Kingdom, Prince Henry, Duke of Gloucester, Mary, Princess Royal and Countess of Harewood, Prince Michael of Kent, Charles, Prince of Wales, Baudouin of Belgium, Albert II of Belgium, Prince Amedeo of Belgium, Archduke of Austria-Este, Franz Joseph II, Prince of Liechtenstein, Hans-Adam II of Liechtenstein, Prince Constantin of Liechtenstein, Princess Nora of Liechtenstein (the Liechtensteins, originally an Austrian noble family, always married nobles much more often than royals), Gustaf VI Adolf of Sweden, Princess Désirée, Baroness Silfverschiöld, Infanta Pilar, Duchess of Badajoz, Infanta Elena, Duchess of Lugo, Princess Marie Adelaide of Luxembourg, Princess Marie Gabriele of Luxembourg, Guillaume, Hereditary Grand Duke of Luxembourg, and Princess Charlotte, Duchess of Valentinois or untitled nobility as Philippe of Belgium and Beatrix of the Netherlands, and very often commoners, as Carl XVI Gustaf of Sweden, Victoria, Crown Princess of Sweden, Harald V of Norway, Haakon, Crown Prince of Norway, Henri of Luxembourg, Felipe VI of Spain, Willem-Alexander of the Netherlands, Frederik, Crown Prince of Denmark, Prince William, Duke of Cambridge and Albert II of Monaco have done.
Among Europe's current kings, queens and heirs apparent, only Elizabeth II of the United Kingdom and Alois, Hereditary Prince of Liechtenstein married members of a foreign dynasty, as did the abdicated Juan Carlos I of Spain.[n 7]
Members of two reigning houses
Examples of royal intermarriage since 1918 include:
- Prince Nikolaus of Liechtenstein and Princess Margaretha of Luxembourg (1982, most recent example of intermarriage between two European dynasties reigning at the time of the wedding, as of 2020[update])
- Constantine II of Greece and Princess Anne Marie of Denmark (1964)
- Hereditary Grand Duke Jean of Luxembourg and Princess Joséphine Charlotte of Belgium (1953)
- Princess Elizabeth of the United Kingdom and Prince Philip of Greece and Denmark (1947)
- Peter II of Yugoslavia and Princess Alexandra of Greece and Denmark (1944)
- Prince Aimone, Duke of Spoleto and Princess Irene of Greece and Denmark (1939)
- Crown Prince Frederick of Denmark and Princess Ingrid of Sweden (1935)
- Prince George, Duke of Kent and Princess Marina of Greece and Denmark (1934)
- Boris III of Bulgaria and Princess Giovanna of Italy (1930)
- Umberto, Prince of Piedmont and Princess Marie José of Belgium (1930)
- Crown Prince Olav of Norway and Princess Märtha of Sweden (1929)
- Prince Leopold, Duke of Brabant and Princess Astrid of Sweden (1926)
- Prince Paul of Yugoslavia and Princess Olga of Greece and Denmark (1923)
- Alexander I of Yugoslavia and Princess Maria of Romania (1922)
- Crown Prince Carol of Romania and Princess Helen of Greece and Denmark (1921)
- Crown Prince George of Greece and Princess Elisabeth of Romania (1921)
- Prince Axel of Denmark and Princess Margaretha of Sweden (1919)
Members of one reigning house and one non-reigning house
Examples since 1918 include:
- Princess Caroline of Monaco and Ernst August, Prince of Hanover (1999)
- Alois, Hereditary Prince of Liechtenstein and Duchess Sophie in Bavaria (1993)
- Prince Gundakar of Liechtenstein and Princess Marie d'Orléans (1989)
- Princess Astrid of Belgium and Archduke Lorenz of Austria-Este (1984)
- Princess Marie-Astrid of Luxembourg and Archduke Carl Christian of Austria (1982)
- Princess Barbara of Liechtenstein and Prince Alexander of Yugoslavia (1973)
- Princess Benedikte of Denmark and Richard, 6th Prince of Sayn-Wittgenstein-Berleburg (1968) 
- Princess Irene of the Netherlands and Hereditary Prince Carlos Hugo of Parma (1964)
- Princess Sophia of Greece and Denmark and Juan Carlos, Prince of Asturias (1962)
- Princess Birgitta of Sweden and Prince Johann Georg of Hohenzollern (1961)
- Prince Alexander of Liechtenstein and Princess Josephine of Löwenstein-Wertheim-Rosenberg (1961)
- Princess Alix of Luxembourg and Prince Antoine de Ligne (1950) 
- Prince Heinrich of Liechtenstein and Archduchess Elisabeth of Austria (1949)
- Prince Karl Alfred of Liechtenstein and Archduchess Agnes Christina of Austria (1949)
- Princess Eugénie of Greece and Denmark and Raimundo, 2nd Duke of Castel Duino (1949)
- Prince Georg Hartmann of Liechtenstein and Duchess Maria Christina of Württemberg (1948)
- Princess Sophie of Greece and Denmark and Prince George William of Hanover (1946)
- Prince Hans-Moritz of Liechtenstein and Princess Clotilde of Thurn and Taxis (1944)
- Princess Maria Francesca of Savoy and Prince Luigi of Bourbon-Parma (1939)
- Prince Eugenio, Duke of Ancona and Princess Lucia of Bourbon-Two Sicilies (1938)
- Princess Eugénie of Greece and Denmark and Prince Dominik Rainer Radziwiłł (1938)
- Crown Prince Paul of Greece and Princess Frederica of Hanover (1938)
- Princess Feodora of Denmark and Prince Christian of Schaumburg-Lippe (1937)
- Princess Juliana of the Netherlands and Prince Bernhard of Lippe-Biesterfeld (1936)
- Prince Gustaf Adolf, Duke of Västerbotten and Princess Sibylla of Saxe-Coburg and Gotha (1932)
- Princess Theodora of Greece and Denmark and Berthold, Margrave of Baden (1931)
- Princess Ileana of Romania and Archduke Anton of Austria (1931)
- Princess Margarita of Greece and Denmark and Prince Gottfried of Hohenlohe-Langenburg (1931)
- Princess Cecilie of Greece and Denmark and Georg Donatus, Hereditary Grand Duke of Hesse (1931)
- Princess Sophie of Greece and Denmark and Prince Christoph of Hesse (1930)
- Princess Hilda of Luxembourg and Prince Adolph of Schwarzenberg (1930)
- Prince Christopher of Greece and Denmark and Princess Françoise of Orléans (1929)
- Prince Filiberto, Duke of Pistoia and Princess Lydia d'Arenberg (1928)
- Prince Amedeo, Duke of Apulia and Princess Anne of Orléans (1927)
- Princess Mafalda of Savoy and Prince Philipp of Hesse (1925)
- Princess Nadezhda of Bulgaria and Duke Albrecht Eugen of Württemberg (1924)
- Princess Elisabeth of Luxembourg and Prince Ludwig Philipp of Thurn and Taxis (1922)
- Princess Margaret of Denmark and Prince René of Bourbon-Parma (1921)
- Princess Sophie of Luxembourg and Prince Ernst Heinrich of Saxony (1921)
- Princess Antonia of Luxembourg and Rupprecht, Crown Prince of Bavaria (1921)
- Princess Maria Bona of Savoy-Genoa and Prince Konrad of Bavaria (1921)
- Charlotte, Grand Duchess of Luxembourg and Prince Felix of Bourbon-Parma (1919)
Modern examples of dynastic intra-marriage
Recent examples since 1918 include:
|Monarch||Cousin||Removed||Most recent common ancestor||Death of MRCA||Gen. from JWF|
|Elizabeth II of the United Kingdom||---||----||------||------||9|
|Harald V of Norway||2nd||none||Edward VII of the United Kingdom||6-May-1910||10|
|Margrethe II of Denmark||3rd||Christian IX of Denmark||29-Jan-1906|
|Carl XVI Gustaf of Sweden||Victoria of the United Kingdom||22-Jan-1901|
|Felipe VI of Spain||once||11|
|Albert II of Belgium||none||Christian IX of Denmark||29-Jan-1906||10|
|Henri of Luxembourg||once|
|Willem-Alexander of the Netherlands||5th||Frederick II Eugene, Duke of Württemberg||25-Dec-1797|
|Hans-Adam II of Liechtenstein||7th||John William Friso, Prince of Orange||14-Jul-1711|
|Albert II of Monaco||twice|
From the time of the Umayyad conquest of Hispania and throughout the Reconquista, marriage between Spanish and Umayyad royals was not uncommon. Early marriages, such as that of Abd al-Aziz ibn Musa and Egilona at the turn of the 8th century, was thought to help establish the legitimacy of Muslim rule on the Iberian Peninsula. Later instances of intermarriage were often made to seal trade treaties between Christian kings and Muslim caliphs.
The marriages of Ottoman sultans and their sons in the fourteenth and fifteenth centuries tended to be with members of the ruling dynasties of neighbouring powers. With little regard for religion, the sultans contracted marriages with both Christians and Muslims; the purpose of these royal intermarriages were purely tactical. The Christian Byzantines and Serbians, as well as the Muslim beyliks of Germiyan, Saruhan, Karaman and Dulkadir were all potential enemies and marriage was seen as a way of securing alliances with them. Marriage with foreign dynasties seems to have ceased in 1504, with the last marriage of a sultan to a foreign princess being that of Murad II and Mara Branković, daughter of the Serbian ruler Đurađ Branković, in 1435. By this time, the Ottomans had consolidated their power in the area and absorbed or subjugated many of their former rivals, and so marriage alliances were no longer seen as important to their foreign policy.
The Islamic principle of kafa'a discourages the marriages of women to men of differing religion or of inferior status.[n 9] Neighbouring Muslim powers did not start to give their daughters in marriage to Ottoman princes until the fifteenth century, when they were seen to have grown in importance. This same principle meant that, while Ottoman men were free to marry Christian women, Muslim princesses were prevented from marrying Christian princes.
Post World War I era
There are several modern instances of intermarriage between members of the royal families and former royal families of Islamic states (i.e., Jordan, Morocco, Saudi Arabia, the constituent states of the United Arab Emirates, etc.).
- Muhammad Ali, Prince of the Sa'id, son of Fuad II of Egypt and Princess Noal Zaher Shah, granddaughter Zahir Shah of Afghanistan (2013)
- Sheik Khalid bin Hamad Al Khalifa, son of Hamad Al Khalifa, King of Bahrain and Princess Sahab bint Abdullah, daughter of Abdullah, King of Saudi Arabia (2011)
- Sheik Mansour bin Zayed Al Nahyan, half-brother of Khalifa bin Zayed Al Nahyan, Emir of Abu Dhabi and President of the United Arab Emirates (UAE), and Sheika Manal bint Mohammed bin Rashid Al Maktoum, daughter of Mohammed bin Rashid Al Maktoum, Emir of Dubai and Prime Minister of UAE (2005)
- Sheikh Mohammed bin Rashid Al Maktoum of Dubai and Princess Haya bint Hussein of Jordan (2004)
- Abdullah of Pahang and Tunku Azizah Aminah Maimunah of Johor (1986)
- Ibrahim Ismail, Sultan of Johor and Raja Zarith Sofia of Perak (1982)
- Mohamed Abdel Moneim and Neslişah Sultan, granddaughter of Ottoman Sultan Mehmed VI (1940)
- Prince Nayef bin Abdullah and Princess Mihrimah Sultan, granddaughter of Ottoman Sultan Mehmed V (1940)
- Mohammad Reza Pahlavi of Iran and Princess Fawzia Fuad of Egypt (1939)
- Senije Zogu, sister of Zogu I of Albania, and Şehzade Mehmed Abid, son of Abdul Hamid II (1936)
- Ahmad Al-Jaber Al-Sabah and Şükriye Sultan, granddaughter of Ottoman Sultan Abdülaziz (1935)
- Azam Jah and Princess Durru Shehvar, daughter of Abdul Mejid II.
- Dürrüşehvar Sultan, daughter of Ottoman Caliph Abdulmejid II, and Azam Jah, son of Nizam of Hyderabad Asaf Jah VII (1931) 
There are also numerous cases of intramarriage between cadet branches within the ruling families from the Arabian Peninsula, including the House of Saud, the House of Al Sabah, the House of Khalifa, the House of Al Thani, and the House of Al Said. Other such examples include Prince Hamzah bin Hussein and Princess Noor bint Asem (2003), Hussein of Jordan and Dina bint Abdul-Hamid (1955), Talal of Jordan and Zein Al-Sharaf Talal (1934), and Ghazi of Iraq and Aliya bint Ali (1934), all from the Hashemite dynasty.
Royal incest was extremely common in the Kingdom of Hawaii and its predecessors, despite being rare in other Polynesian societies. Among the aliʻi, the ruling class, marriage between blood relatives of the first degree was believed to produce children with the highest rank under the kapu system, equal to that of the gods. A marriage between brother and sister was considered "the most perfect and revered union". It was believed that the mana of a particular aliʻi could be increased by incestuous unions. According to O. A. Bushnell, "in several accounts about Hawaiians, an ali’i who was the issue of an incestuous marriage [...] was noted for a splendid body and a superior intelligence". Writers have suggested that this preference for brother–sister incest came about as a way to protect the royal bloodline. Notable instances of incestuous relationships among Hawaiian royalty were those between King Kamehameha II and his half-sister Kamāmalu, which was a fully fledged marriage, and between Kamehameha III and his full sister Nahienaena. In the latter case, the siblings had hoped to marry but their union was opposed by Christian missionaries.
At one time, some dynasties adhered strictly to the concept of royal intermarriage. The Habsburgs, Sicilian and Spanish Bourbons and Romanovs, among others, introduced house laws which governed dynastic marriages; it was considered important that dynasts marry social equals (i.e., other royalty), thereby ruling out even the highest-born non-royal nobles. Those dynasts who contracted undesirable marriages often did so morganatically. Generally, this is a marriage between a man of high birth and a woman of lesser status (such as a daughter of a low-ranked noble family or a commoner). Usually, neither the bride nor any children of the marriage has a claim on the bridegroom's succession rights, titles, precedence, or entailed property. The children are considered legitimate for all other purposes and the prohibition against bigamy applies.
Examples of morganatic marriages include:
- Grand Duke Constantine Pavlovich and Countess Joanna Grudna-Grudzińska (1796)
- Duke Alexander of Württemberg and Countess Claudine Rhédey von Kis-Rhéde (1835)
- Prince Alexander of Hesse and by Rhine and Countess Julia Hauke (1851)
- Archduke Franz Ferdinand of Austria and Countess Sophie Chotek von Chotkova und Wognin (1900)
Over time, because of the relatively limited number of potential consorts, the gene pool of many ruling families grew progressively smaller, until all European royalty was related. This also resulted in many being descended from a certain person through many lines of descent, such as the numerous European royalty descended from Queen Victoria of the United Kingdom or King Christian IX of Denmark. The House of Habsburg was infamous for inbreeding, with the Habsburg lip cited as an ill effect, although no genetic evidence has proved the allegation. The closely related houses of Habsburg, Bourbon, Braganza and Wittelsbach[n 10] also engaged in first-cousin unions frequently and in double-cousin and uncle-niece marriages occasionally.
When Francis II, Holy Roman Emperor married Maria Theresa of Naples and Sicily in 1790, they were double first cousins having the same set of grandparents. Francis became the first Emperor of Austria in 1804 and dissolved the Holy Roman Empire in 1806. All later Emperors of Austria and heads of the House of Habsburg were descendants of this union.
Examples of incestuous marriages and the impact of inbreeding on royal families include:
- All rulers of the Ptolemaic dynasty from Ptolemy II were married to their brothers and sisters, in order to keep the Ptolemaic blood "pure" and to strengthen the line of succession. King Tutankhamun's father and mother were related. Cleopatra VII (also called Cleopatra VI) and Ptolemy XIII, who married and became co-rulers of ancient Egypt following their father's death, are the most widely known example.
- The Persian Sassanian dynasty often married close blood relatives, partially for religious reasons (see xwedodah). One example would be Narseh, who married his sister Shapuhrdukhtag.
- Jean V of Armagnac was said to have formed a rare brother-sister liaison, left descendants and claimed to be married. There is no evidence that this "marriage" was contracted for dynastic rather than personal reasons.
- One of the most famous examples of a genetic trait aggravated by royal family intermarriage was the House of Habsburg, which inmarried particularly often and is known for the mandibular prognathism of the Habsburger (Unter) Lippe (otherwise known as the 'Habsburg jaw', 'Habsburg lip' or 'Austrian lip'"). This was typical for many Habsburg relatives over a period of six centuries.
- List of coupled cousins
- Haemophilia in European royalty
- Inbreeding depression
- Prohibited degree of kinship
- George I inherited the throne of Great Britain through his mother, Sophia of Hanover, a female line descendant of James VI and I.
- The crowns of the kingdoms of Aragon and Castile came under Habsburg rule when they were inherited by Charles V, Holy Roman Emperor, son of Joanna, Queen of Castile and Aragon and Philip the Handsome, son of Maximilian I, Holy Roman Emperor.
- A prime example is the marriage of the Catholic Henrietta Maria and Charles I of England. Her open practice of her faith and insistence on maintaining a Catholic retinue during a time of religious intolerance in English society eventually made her a deeply unpopular queen with the general public.
- Russian dynasts often only married foreign princesses when they converted to Russian Orthodoxy. For example, Alix of Hesse, wife of Nicholas II, converted from her native Lutheranism.
- Justin I's wife, Euphemia, was reported to be both a slave and a barbarian, and Justinian II's wife, Theodora, was an actor and, some claim, a prostitute.
- Donald MacGillivray Nicol says in The Last Centuries of Byzantium 1261–1453: "The daughters of Alexios II Grand Komnenos married the emirs of Sinope and of Erzindjan, his granddaughters married the emir of Chalybia and the Turkoman chieftain of the so-called Ak-Koyunlu, or horde of the White Sheep; his great-granddaughters, the children of Alexios III, who died in 1390, performed even greater service to the Empire."
- Both Elizabeth II of the United Kingdom and Juan Carlos I of Spain have married members of the Greek royal family, Prince Philip of Greece and Denmark and Princess Sophia of Greece and Denmark respectively. In 1993, Alois, Hereditary Prince of Liechtenstein married Duchess Sophie in Bavaria, a member of the House of Wittelsbach. Both the Greek royal dynasty, the House of Glücksburg, and the House of Wittelsbach have been deposed.
- Knud, Hereditary Prince of Denmark and Princess Caroline-Mathilde of Denmark, married in 1933, were first cousins and members of the House of Glücksburg, as male-line grandchildren of Frederick VIII of Denmark.
- Carolyn Fluehr-Lobban explains in her article Islamic Law and Society in the Sudan that "It is preferable that a non-Muslim convert to Islam before marriage to a Muslim man, however, it is not essential – it is essential that a non-Muslim man convert to Islam before contemplating marriage with a Muslim woman"
- The Wittlesbach line suffered from several cases of mental illness, often attributed to their frequent intermarriages. Several family members suffered from mental and physical illnesses, as well as epilepsy
References and Sources
- Cohen, p.165
- Thomson, pp.79–80
- Bucholz, p.228
- Dobbs, David
- 'Wedding Brings Xhosa, Zulu Tribes Together', LA Times
- 'The Bafokeng: Getting royalty right', News24.com, 13 November 2012
- 'Nelson Mandela: A Unique World Leader Dies At 95', Nigerian Echo
- Kobo, p.46
- Liu & Perry
- Thailand Country Study
- Stengs, p.275
- Kenneth R. Hall (2008). Secondary Cities and Urban Networking in the Indian Ocean Realm, C. 1400–1800. Lexington Books. pp. 159–. ISBN 978-0-7391-2835-0. Archived from the original on 22 October 2016. Retrieved 25 March 2017.
- Ainslie Thomas Embree; Robin Jeanne Lewis (1988). Encyclopedia of Asian history. Scribner. p. 190. ISBN 9780684189017. Archived from the original on 22 October 2016. Retrieved 25 March 2017.
- Kenneth R. Hall (2008). Secondary Cities and Urban Networking in the Indian Ocean Realm, C. 1400–1800. Lexington Books. pp. 161–. ISBN 978-0-7391-2835-0.
- K. W. Taylor (9 May 2013). A History of the Vietnamese. Cambridge University Press. pp. 166–. ISBN 978-0-521-87586-8.
- Mai Thục, Vương miện lưu đày: truyện lịch sử, Nhà xuất bản Văn hóa – thông tin, 2004, p.580; Giáo sư Hoàng Xuân Việt, Nguyễn Minh Tiến hiệu đính, Tìm hiểu lịch sử chữ quốc ngữ, Ho Chi Minh City, Công ty Văn hóa Hương Trang, pp.31–33; Helen Jarvis, Cambodia, Clio Press, 1997, p.xxiii.
- Nghia M. Vo; Chat V. Dang; Hien V. Ho (29 August 2008). The Women of Vietnam. Saigon Arts, Culture & Education Institute Forum. Outskirts Press. ISBN 978-1-4327-2208-1.
- Henry Kamm (1998). Cambodia: report from a stricken land. Arcade Publishing. p. 23. ISBN 978-1-55970-433-5.
chey chettha II.
- "Nguyễn Bặc and the Nguyễn". Archived from the original on 13 April 2009. Retrieved 16 June 2010.
- , p. 31.
- Qian Sima; Burton Watson (January 1993). Records of the Grand Historian: Han dynasty. Renditions-Columbia University Press. pp. 161–. ISBN 978-0-231-08166-5.
- Monumenta Serica. H. Vetch. 2004. p. 81.
- Frederic E. Wakeman (1985). The Great Enterprise: The Manchu Reconstruction of Imperial Order in Seventeenth-century China. University of California Press. pp. 41–. ISBN 978-0-520-04804-1.
- Veronika Veit, ed. (2007). The role of women in the Altaic world: Permanent International Altaistic Conference, 44th meeting, Walberberg, 26–31 August 2001. Volume 152 of Asiatische Forschungen (illustrated ed.). Otto Harrassowitz Verlag. p. 61. ISBN 978-3447055376. Retrieved 8 February 2012.
- Michael Robert Drompp (2005). Tang China and the collapse of the Uighur Empire: a documentary history. Volume 13 of Brill's Inner Asian library (illustrated ed.). BRILL. p. 126. ISBN 978-9004141292. Retrieved 8 February 2012.
- Lin Jianming (林剑鸣) (1992). 秦漢史 [History of Qin and Han]. Wunan Publishing. pp. 557–8. ISBN 978-957-11-0574-1.
- Rubie Sharon Watson (1991). Marriage and Inequality in Chinese Society. University of California Press. pp. 80–. ISBN 978-0-520-07124-7.
- Lee (2014).
- Papers on Far Eastern History. Australian National University, Department of Far Eastern History. 1983. p. 86.
- China: Dawn of a Golden Age, 200–750 AD. Metropolitan Museum of Art. 2004. pp. 30–. ISBN 978-1-58839-126-1.
- Ancient and Early Medieval Chinese Literature (vol.3 & 4): A Reference Guide, Part Three & Four. BRILL. 22 September 2014. pp. 1566–. ISBN 978-90-04-27185-2.
- China: Dawn of a Golden Age, 200–750 AD. Metropolitan Museum of Art. 2004. pp. 18–. ISBN 978-1-58839-126-1.
- Biographical Dictionary of Chinese Women: Antiquity Through Sui, 1600 B.C.E.-618 C.E. M.E. Sharpe. 2007. pp. 316–. ISBN 978-0-7656-4182-3.
- Gao Huan, as demanded by Yujiulü Anagui as one of the peace terms between Eastern Wei and Rouran, married the Princess Ruru in 545, and had her take the place of Princess Lou as his wife, but never formally divorced Princess Lou. After Gao Huan's death, pursuant to Rouran customs, the Princess Ruru became married to Gao Huan's son Gao Cheng, who also, however, did not formally divorce his wife.
- Baij Nath Puri (1987). Buddhism in Central Asia. Motilal Banarsidass. pp. 78–. ISBN 978-81-208-0372-5.
- Charles Eliot; Sir Charles Eliot (1998). Hinduism and Buddhism: An Historical Sketch. Psychology Press. pp. 206–. ISBN 978-0-7007-0679-2.
- Marc S. Abramson (31 December 2011). Ethnic Identity in Tang China. University of Pennsylvania Press. pp. 119–. ISBN 978-0-8122-0101-7.
- Roy Andrew Miller (1959). Accounts of Western Nations in the History of the Northern Chou Dynasty [Chou Shu 50. 10b-17b]: Translated and Annotated by Roy Andrew Miller. University of California Press. pp. 5–. GGKEY:SXHP29BAXQY.
- Jonathan Karam Skaff (1998). Straddling steppe and town: Tang China's relations with the nomads of inner Asia (640–756). University of Michigan. p. 57. ISBN 9780599084643.
- Asia Major. Institute of History and Philology of the Academia Sinica. 1998. p. 87.
- Veit, p.57
- Eighteen Lectures on Dunhuang. BRILL. 7 June 2013. pp. 44–. ISBN 978-90-04-25233-2.
- Lilla Russell-Smith (2005). Uygur Patronage In Dunhuang: Regional Art Centres On The Northern Silk Road In The Tenth and Eleventh Centuries. BRILL. pp. 63–. ISBN 978-90-04-14241-1.
- Wenjie Duan; Chung Tan (1 January 1994). Dunhuang Art: Through the Eyes of Duan Wenjie. Abhinav Publications. pp. 189–. ISBN 978-81-7017-313-7.
- Lilla Russell-Smith (2005). Uygur Patronage In Dunhuang: Regional Art Centres On The Northern Silk Road In The Tenth and Eleventh Centuries. BRILL. pp. 23–. ISBN 978-90-04-14241-1.
- Biran 2012, p. 88.
- Biran 2012, p. 88.
- Cha 2005, p. 51. 
- Yang, Shao-yun (2014). "Fan and Han: The Origins and Uses of a Conceptual Dichotomy in Mid-Imperial China, ca. 500–1200". In Fiaschetti, Francesca; Schneider, Julia (eds.). Political Strategies of Identity Building in Non-Han Empires in China. Wiesbaden: Harrassowitz Verlag. p. 22.
- Orient. Maruzen Company. 2004. p. 41.
- Orient. Maruzen Company. 2004. p. 41.
- Hsueh-man Shen (1 September 2006). Gilded splendor: treasures of China's Liao Empire (907–1125). 5 continents. p. 106. ISBN 978-88-7439-332-9.
- Jiayao An (1987). Early Chinese Glassware. Millennia. p. 12.
- http://kt82.zhaoxinpeng.com/view/138019.htm[permanent dead link] https://www.academia.edu/4954295/La_Steppe_et_l_Empire_la_formation_de_la_dynastie_Khitan_Liao_
- Zhao, p.34
- Walthall, p.138
- Walthall, p.149
- Anne Walthall (2008). Servants of the Dynasty: Palace Women in World History. University of California Press. pp. 148–. ISBN 978-0-520-25444-2.
- Frederic Wakeman (1 January 1977). Fall of Imperial China. Simon and Schuster. pp. 79–. ISBN 978-0-02-933680-9.
- Rubie Sharon Watson (1991). Marriage and Inequality in Chinese Society. University of California Press. pp. 179–180. ISBN 978-0-520-07124-7.
- "Archived copy". Archived from the original on 3 December 2017. Retrieved 30 June 2016.CS1 maint: archived copy as title (link)
- "Archived copy". Archived from the original on 7 October 2016. Retrieved 30 June 2016.CS1 maint: archived copy as title (link)
- "手游加入竞赛系统《坦克世界：闪击战》发力电竞09-08作者：endure58 endure58未经授权不得转载-莴苣设备有限公司".
- Evelyn S. Rawski (15 November 1998). The Last Emperors: A Social History of Qing Imperial Institutions. University of California Press. pp. 72–. ISBN 978-0-520-92679-0.
- FREDERIC WAKEMAN JR. (1985). The Great Enterprise: The Manchu Reconstruction of Imperial Order in Seventeenth-century China. University of California Press. pp. 1017–. ISBN 978-0-520-04804-1.
- FREDERIC WAKEMAN JR. (1985). The Great Enterprise: The Manchu Reconstruction of Imperial Order in Seventeenth-century China. University of California Press. pp. 1018–. ISBN 978-0-520-04804-1.
- Rubie Sharon Watson (1991). Marriage and Inequality in Chinese Society. University of California Press. pp. 179–. ISBN 978-0-520-07124-7.
- Kim, p.56
- FREDERIC WAKEMAN JR. (1985). The Great Enterprise: The Manchu Reconstruction of Imperial Order in Seventeenth-century China. University of California Press. pp. 892–. ISBN 978-0-520-04804-1. Archived from the original on 22 October 2016. Retrieved 25 March 2017.
- Frank W. Thackeray; John E. Findling (31 May 2012). Events That Formed the Modern World. ABC-CLIO. pp. 200–. ISBN 978-1-59884-901-1. Archived from the original on 22 October 2016. Retrieved 25 March 2017.
- Arthur W. Hummel (1991). Eminent Chinese of the Ch'ing period: 1644-1912. SMC publ. p. 217. ISBN 978-957-638-066-2. Archived from the original on 25 March 2017. Retrieved 25 March 2017.
- Library of Congress. Orientalia Division (1943). 清代名人傳略: 1644-1912. 經文書局. p. 217. Archived from the original on 22 October 2016. Retrieved 25 March 2017.
- Raymond Stanley Dawson (1972). Imperial China. Hutchinson. p. 275. ISBN 9780091084806. Archived from the original on 22 October 2016. Retrieved 25 March 2017.
- Raymond Stanley Dawson (1976). Imperial China. Penguin. p. 306.
- 梨大史苑. 梨大史學會. 1968. p. 105. Archived from the original on 22 October 2016. Retrieved 25 March 2017.
- "The annals of the Joseon princesses. – the Gachon Herald".
- Li Ling (1995). Son of Heaven. Chinese Literature Press. p. 217. ISBN 978-7-5071-0288-8. Archived from the original on 22 October 2016. Retrieved 25 March 2017.
- Kowner, p.478
- Beeche (2009), p.1
- 'Charles V', Encyclopædia Britannica
- Heimann, pp.38–45
- Christakes, p.437
- Maland, p.227
- Verzijl, p.301
- anselme, p.145
- Griffey, p.3
- BAILII, 'Act of Settlement 1700'
- Mandelstam Balzer, p.56
- Rushton, p.12
- Curtis, p.271
- Beéche, p.257
- Czaplinski, pp.205–208
- Durant, pp.552–553, 564–566, 569, 571, 573, 576
- Prazmowska, p.56
- Beeche (2010), p.24
- Greenfeld, p.110
- Warwick, p.36
- Salisbury, p.137
- Roller, p.251
- Schürer, Millar & Fergus. p.474
- Morgan Gilman, p.1
- William, p.301
- Garland, p.14
- Frassetto, p.332
- Ostrogorsky, p.441
- Nicol, p.304
- Jackson, p.203
- Nicol, p.403
- Bryer, p.146
- Beeche (2009), p.13
- deBadts de Cugnac, pp.680–681
- 'Queen Anna Maria', The Greek Monarchy
- 'Life Goes to a Twice Royal Wedding: Luxembourg Prince Marries a Princess', Life
- deBadts de Cugnac, pp.514–515, 532
- deBadts de Cugnac, pp.534, 873
- deBadts de Cugnac, p.354
- deBadts de Cugnac, pp.509, 529
- deBadts de Cugnac, p.333
- deBadts de Cugnac, p.620
- deBadts de Cugnac, p.710
- deBadts de Cugnac, p.290
- deBadts de Cugnac, p.870"
- 'Andrea Casiraghi, second in line to Monaco's throne, weds Colombian heiress', The Telegraph
- 'Princess Astrid', The Belgian Monarchy
- deBadts de Cugnac, pp.195, 680–681
- deBadts de Cugnac, pp.641, 876
- deBadts de Cugnac, p.335
- deBadts de Cugnac, pp.590–591, 730
- deBadts de Cugnac, p.849
- deBadts de Cugnac, p.678
- Thomas, p.91
- Montgomery-Massingberd, p.338
- Schaus, p.593
- Albany & Salhab, pp.70–71
- Peirce, pp.30–31
- Magill, p.2566
- "Shaikh Khalid bin Hamad marries daughter of Saudi Monarch". Bahrain News Agency. 16 June 2011. Retrieved 25 March 2016.
- 'Biographies: HRH Princess Haya',Office of HRH Princess Haya Bint Al Hussein
- "RETURN OF THE ROYALS". www.telegraphindia.com. Archived from the original on 21 August 2017. Retrieved 21 August 2017.
- Sarma, 'Bella Vista'
- Joanne Carando (2002). "Hawaiian Royal Incest: A Study in the Sacrificial Origin of Monarchy". Transatlantica. 1.
- deBadts de Cugnac, p.833, 173–175, 368, 545, 780–782
- Beeche (2010), p.vi-x
- Diesbach, pp.25–26
- Diesbach, p.35
- Wortman, p.123
- Vork, p.13
- Thornton, p.162
- Cecil, p.14
- Beeche (2009), p.7
- Owens, p.41
- Ruiz, p.47
- Guyenne, p.45
- 'Topics in the History of Genetics and Molecular Biology: The Habsburg Lip', Michigan State University
- Albany, HRH Prince Michael of; Salhab, Walid Amine (2006). The Knights Templar of the Middle East (1st ed.). MA, USA: Weister Books. ISBN 9781578633463.
- Alexander, Harriet (31 August 2013). "Andrea Casiraghi, second in line to Monaco's throne, weds Colombian heiress". The Telegraph. Retrieved 4 June 2014.
- Anselme, Père (1967). Histoire de la Maison Royale de France (in French). I. Paris: Editions du Palais-Royal. p. 145.
- deBadts de Cugnac, Chantal; Coutant de Saisseval, Guy (2002). Le Petit Gotha [The Little Gotha] (in French). Paris, France: Nouvelle Imprimerie Laballery. ISBN 978-2950797438.
- "Act of Settlement 1700". BAILII. n.d. Retrieved 20 October 2011.
- Ball, Warwick (2000). Rome in the East: The Transformation of an Empire. New York, USA: Routledge. ISBN 9780415243575.
- Beeche, Arturo (2009). The Gotha: Still a Continental Royal Family, Vol. 1. Richmond, US: Kensington House Books. ISBN 9780977196173.
- Beeche, Arturo (2013). The Coburgs of Europe. Richmond, US: Eurohistory. ISBN 9780985460334.
- Beeche, Arturo (2010). The Grand Dukes. Berkeley, CA, US. ISBN 9780977196180.
- Bevan, E.R. "House of Ptolomey, The". uchicago.edu.
- "Biographies: HRH Princess Haya". Office of HRH Princess Haya Bint Al Hussein. n.d. Retrieved 4 June 2014.
- Bryer, Anthony (1975). "Greeks and Türkmens: The Pontic Exception". Dumbarton Oaks Papers. 29: 113–148. doi:10.2307/1291371. JSTOR 1291371.
- Bucholz, Robert; Key, Newton (2009). Early Modern England 1485–1714: A Narrative History. Oxford. ISBN 9781405162753.
- Cecil, Lamar (1996). Wilhelm II: Emperor and exile, 1900–1941. North Carolina, US: The University of North Carolina Press. ISBN 9780807822838.
- de Ferdinandy, Michael (n.d.). "Charles V". Encyclopædia Britannica. Retrieved 30 May 2014.
- Christakes, George (2010). Integrative Problem-Solving in a Time of Decadence. Springer. p. 437. ISBN 9789048198894. Retrieved 27 June 2014.
- Cohen, Raymond; Vestbrook, Raymond (2000). Amarna Diplomacy: The Beginnings of International Relations. Baltimore. ISBN 9780801861994.
- Curtis, Benjamin (2013). The Habsburgs: The History of a Dynasty. London, UK: Bloomsbury Publishing Inc. ISBN 9781441150028.
- Czaplinski, Władysław (1976). Władysław IV i jego czasy [Władysław IV and His Times] (in Polish). Warsaw, Poland: Wiedza Poweszechna.
- Diesbach, Ghislain (1967). Secrets of the Gotha: Private Lives of Royal Families of Europe. London, UK: Chapman & Hall. ISBN 9783928741200.
- Dobbs, David (2011). "The Risks and Rewards of Royal Incest". National Geographic Magazine. Retrieved 24 June 2014.
- Durant, Will (1950). The Story of Civilization: The Age of Faith. IV. New York, USA: Simone and Schuster. ISBN 9781451647617.
- Fleming, Patricia H. (1973). "The Politics of Marriage Among Non-Catholic European Royalty". Current Anthropology. 14 (3): 231–249. doi:10.1086/201323. JSTOR 2740765. S2CID 144634148.
- Fluehr-Lobban, Carolyn (1987). "Islamic Law and Society in the Sudan". Islamic Studies (3 ed.). Islamabad, Pakistan: Islamic Research Institute, International Islamic University. 26 (3): 280–282. JSTOR 20839848.
- Frassetto, Michael (2003). Encyclopedia of Barbarian Europe: Society in Transformation. California, US: ABC-CLIO Ltd. ISBN 9781576072639.
- Garland, Lynda (2002). Byzantine Empresses: Women and Power in Byzantium AD 527–1204. Oxford, UK: Routledge. ISBN 9781134756391.
- Guyenne, Valois (2001). Incest and the Medieval Imagination. Oxford: Oxford University Press. ISBN 9780861932269.
- Greenfeld, Liah (1993). Nationalism: Five Roads to Modernity. USA: Harvard University Press. ISBN 9780674603196.
- Griffey, Erin (2008). Henrietta Maria: piety, politics and patronage. Aldershot, UK: Ashgate Publishing. ISBN 9780754664208.
- Haag, Michael (2003). The Rough Guide History of Egypty. London, UK: Rough Guides Ltd. ISBN 9781858289403. Retrieved 27 June 2014.
- Heimann, Heinz-Dieter (2010). Die Habsburger: Dynastie und Kaiserreiche [The Habsburgs: dynasty and empire] (in German). ISBN 9783406447549.
- Jackson, Peter (2005). The Mongols and the West, 1221-1410. Harlow, UK: Pearson Longman. ISBN 978-0582368965.
- Keller, Bill (1990). "Zulu King Breaks Ties To Buthelezi". The New York Times. Retrieved 28 April 2008.
- Kelly, Edmond (1991). Revolutionary Ethiopia: From Empire to People's Republic. Bloomington, US: Indiana University Press. ISBN 9780253206466.
- Kim, Jinwung (2012). A History of Korea: From "Land of the Morning Calm" to States in Conflict. University of Indiana Press. ISBN 9780253000248.
- Kobo, Ousman (2012). Unveiling Modernity in Twentieth-Century West African Islamic Reforms. Leiden, Netherlands: Kononklijke Brill. ISBN 9789004233133.
- Kowner, Rotem (2012). Race and Racism in Modern East Asia: Western and Eastern Constructions. Leiden: Brill. ISBN 9789004237292.
- Lee Jen-der (2014), "Crime and Punishment: The Case of Liu Hui in the Wei Shu", Early Medieval China: A Sourcebook, New York: Columbia University Press, pp. 156–165, ISBN 978-0-231-15987-6.
- Liu, Caitlin; Perry, Tony (2004). "Thais Saddened by the Death of Young Prince". LA Times. Retrieved 29 April 2014.
- "Life Goes to a Twice Royal Wedding: Luxembourg Prince Marries a Princess". Life. 1953.
- Macurdy, Grace H.; Forrer, Leonard (1993). Two Studies on Women in Antiquity. Illinois, US: Ares Publishers. ISBN 9780890055434.
- Magill, Frank (2014). The 20th Century: Dictionary of World Biography. 8. London, UK: Routledge. ISBN 9781317740605.
- Maland, David (1991). Europe in the Seventeenth Century (Second ed.). London, UK: Macmillan. ISBN 978-0333335741.
- Mandelstam Balzer, Marjorie (2010). Religion and Politics in Russia. New York, US: M.E. Sharpe, Inc. ISBN 9780765624147.
- Montgomery-Massingberd, Hugh (1973). Burke's Guide to the Royal Family. London, UK: Burke's Peerage Limited. ISBN 978-0-220-66222-6.
- Morgan Gilman, Florence (2003). Herodias: At Home in that Fox's Den. US: Liturgical Press. ISBN 9780814651087.
- Nicol, Donald MacGillivray (2004). The Last Centuries of Byzantium 1261–1453. Cambridge, UK: Cambridge University Press. ISBN 9780521439916.
- Opeyemi, Oladunjo (6 December 2013). "Nelson Mandela: A Unique World Leader Dies At 95". Nigerian Echo. Retrieved 2 July 2014.
- Ostrogorsky, George (1969). History of the Byzantine State. New Brunswick, Canada: Rutgers University Press. ISBN 9780521439916.
- Owens, Karen (2013). Franz Joseph and Elisabeth: The Last Great Monarchs of Austria-Hungary. North Carolina, US: McFarland & Co Inc. ISBN 9780786476749.
- Peirce, Leslie P. (1994). The Imperial Harem: Women and Sovereignty in the Ottoman Empire. Oxford, UK: Oxford University Press. ISBN 9780195086775.
- Prazmowska, Anita (2011) . A History of Poland (2 ed.). New York, US: Palgrave Macmillan. ISBN 9780230252356.
- "Prince Muhammed Ali of Egypt and Princess Noal Zaher of Afghanistan Prepare for their Royal Wedding". Hello!. 2013. Retrieved 26 November 2013.
- "Princess Astrid". The Belgian Monarchy. n.d. Retrieved 4 July 2014.
- Qingzhi Zhao, George (2008). Marriage as Political Strategy and Cultural Expression: Mongolian Royal Marriages from World Empire to Yuan Dynasty. New York. ISBN 9781433102752.
- Roller, Duane (1998). The Building Program of Herod the Great. California, US: University of California Press.
- Ruiz, Enrique (2009). Discriminate Or Diversify. Positivepsyche.Biz crop. ISBN 9780578017341.
- Rushton, Alan R. (2008). Royal Maladies: Inherited Diseases in the Ruling Houses of Europe. BC, Canada: Trafford Publishing. ISBN 9781425168100.
- Salisbury, Joyce E. (2001). Encyclopedia of Women in the Ancient World. California, US: ABC-CLIO Inc. ISBN 9781576070925.
- Sarma, Rani (2008). "Bella Vista". The Deodis of Hyderabad a Lost Heritage. New Delhi, Inda: Rupa Co. ISBN 9788129127839.
- Schaus, Margaret (2006). Women and Gender in Medieval Europe: An Encyclopedia. New York, US: Routledge. ISBN 9781135459604.
- Schürer, Emil; Millar, Fergus; Vermes, Geza (2014) . The History of the Jewish People in the Ages of Jesus Christ. 1. IL, US: Bloomsbury Publishing Plc.
- Smith, William (1860). Dictionary of Greek and Roman Biography and Mythology. 1. US: Harvard University. ISBN 9781845110024.
- Stengs, Irene (2009). Worshipping the Great Moderniser: King Chulalongkporn, Patron Saint of the Thai Middle Class. Washington, US: University of Washington Press. ISBN 9780295989174.
- Thailand Country Study Guide (4th ed.). Washington DC, US: International Business Publications USA. 2007. ISBN 9781433049194.
- Thornton, Michael (1986). Royal Feud: The Dark Side of the Love Story of the Century. New York, US: Random House Publishing. ISBN 9780345336828.
- Thomas, Alastair H. (2010). The A to Z of Denmark. Washington DC, US: Scarecrow Press. ISBN 9781461671848.
- Thomson, David (1961). Europe Since Napoleon. New York: Knopf. ISBN 9780140135619.
- "Topics in the History of Genetics and Molecular Biology: The Habsburg Lip". Michigan State University. 2000. Retrieved 4 June 2014.
- "Tribute to mothers' caring nature". The Star. 2008. Archived from the original on 8 June 2011. Retrieved 25 June 2014.
- "Queen Anne Marie". The Greek Monarchy. n.d. Retrieved 5 June 2014.
- Veit, Veronika (2007). The Role of Women in the Altaic World. Germany: Harrassowitz. ISBN 9783447055376.
- Verlag, Starke (1997). Genealogisches Handbuch des Adels, Fürstliche Häuser XV [Genealogical Handbook of the nobility, Princely houses XV] (in German). ISBN 9783798008342.
- Verzijl, J. H. W. "International Law in Historical Perspective". Nova et Vetera Iuris Gentium. III.
- Vork, Justin (2012). Imperial Requiem: Four Royal Women and the Fall of the Age of Empires. Bloomington, US: iUniverse.com. ISBN 9781475917499.
- Walthall, Anne (2008). Servants of the Dynasty: Palace Women in World History. London. ISBN 9780520254442.
- "Wedding Brings Xhosa, Zulu Tribes Together". Los Angeles Times. California. 2002. Retrieved 7 April 2013.
- Wortman, Richard (2013). Scenarios of Power: Myth and Ceremony in Russian Monarchy from Peter the Great to the Abdication of Nicholas II. New Jersey, US: Princeton University Press. ISBN 9781400849697.