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A king-emperor, the female equivalent being queen-empress, is a sovereign ruler who is simultaneously a king of one territory and emperor of another. This title usually results from a merger of a royal and imperial crown (as in Austria-Hungary), but recognises that the two territories are different politically or culturally and in status (emperor being a higher rank than king). It also denotes a king's imperial status through the acquisition of an empire or vice versa.
The dual title signifies a sovereign's dual role, but may also be created to improve a ruler's prestige. Both cases, however, show that the merging of rule was not simply a case of annexation where one state is swallowed by another, but rather of unification and almost equal status, though in the case of the British monarchy the suggestion that an emperor is higher in rank than a king was avoided by creating the title "king-emperor" ("queen-empress") instead of "emperor-king" ("empress-queen").
In the British Empire
Following the Proclamation of Empire in 1877, when the British Crown took over from the East India Company the administration of British India, Queen Victoria was considered to have gained Imperial status and assumed the title Empress of India. She was thus the Queen-Empress, and her successors, until George VI, were known as King-Emperors. This title was the shortened form of the full title, and in widespread popular use.
The reigning King-Emperors or Queen-Empress used the initials R I (Rex Imperator or Regina Imperatrix) or the abbreviation Ind. Imp. (Indiae Imperator/Imperatrix) after their name (while the one reigning Queen-Empress, Victoria, used the initials R I, the three consorts of the married King-Emperors simply used R).
British coins, and those of the British Empire and Commonwealth dominions routinely included some variation of the titles Rex Ind. Imp., although in India itself the coins said "Empress", and later "King Emperor." When in 1947 India became independent all dies had to be changed to remove the latter two abbreviations, in some cases taking up to a year. In Great Britain coins of George VI carried the title up to 1948.
Another use of this dual title was when in 1867 the multi-national Austrian Empire, which was German-ruled and facing growing nationalism, undertook a reform that gave nominal and factual rights to Hungarian nobility. This reform revived the Austrian-annexed Kingdom of Hungary, and therefore created the dual-monarchic union state of Austria-Hungary and the dual title of "emperor-king" (in German Kaiser und König).
The Habsburg dynasty therefore ruled as Emperors of Austria over the western and northern half of the country, and as Kings of Hungary over the Kingdom of Hungary. Hungary enjoyed some degree of self-government and representation in joint affairs (principally foreign relations and defence). The federation bore the full name of "The Kingdoms and Lands Represented in the Imperial Council and the Lands of the Crown of St. Stephen".
In Italian colonial empire
In 1936, with the Italian conquest of Ethiopia, Victor Emmanuel III was proclaimed Emperor of Ethiopia. Thus he became King-Emperor (in Italian Re Imperatore), i.e., King of Italy and Emperor of Ethiopia, because conquered Ethiopia was at that time an Empire. In the following years foreign countries recognized the Italian rule in Ethiopia (UK in 1937).
The King-Emperor was represented by the Viceroy that was also appointed as Governor-General of the Italian East Africa (AOI - Africa Orientale Italiana). The capital city of the Governor General was Addis Ababa.
- The Serbian emperor Stefan Dušan (r. 1346–55), earlier king (1331–45), is attested with the title "Emperor of Greece and King of All Serb Lands and the Maritime" in a document dating to between 1347–56 (see also Emperor of the Serbs). Dušan has been described as a "king-emperor".
- The aforementioned German Empire was also ruled by a King-Emperor, as the German Hohenzollern Emperor was also King of Prussia.
- The Holy Roman Emperors were also Kings of Italy, Germany and Burgundy for most of the time that title existed. They were also Kings of France, Spain, Rome, Sicily, Naples, Bohemia and Jerusalem at other times.
- Emperor Napoléon I of the French was also King of Italy. His title was shortened in "Emperor-King" (Empereur-Roi or l'Empereur et Roi) rather than "King-Emperor".
- John VI of Portugal was made titular Emperor of Brazil alongside being King of Portugal and was titled as King-Emperor until his death. After John IV's death, his son Pedro briefly acceded him as King of Portugal while reigning as Emperor of Brazil.
- Imperial cult
- Kaiserlich und königlich
- King-Grand Duke
- Indian Army during the reign of the King-Emperors
- Miklošič, Franc (1858). Monumenta serbica spectantia historiam Serbiae, Bosnae, Ragusii ed: Fr. apud Guilelmum Braumüller. p. 154.
- James Evans (30 July 2008). Great Britain and the Creation of Yugoslavia: Negotiating Balkan Nationality and Identity. I.B.Tauris. p. 81. ISBN 978-0-85771-307-0.