Crown Prince of Thailand

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Standard of the Crown Prince of Siam (1897–1910)

The Crown Prince of Thailand (or Siam) (Thai: สยามมกุฎราชกุมาร; rtgsSayammakutratchakuman) is a title held by the heir apparent to the Thai throne. First created by King Chulalongkorn (Rama V) in 1886, for his son Prince Maha Vajirunhis, the king's eldest son by a royal wife Queen Savang Vadhana. Prior to this, the Siamese throne did not have a law or formal system regulating the royal succession. In 1688 King Petracha of Ayutthaya created the title of Front Palace, which by the Rattanakosin period had become the main title granted to the heir presumptive to the throne. However few Front Palaces have succeeded to the throne this way, with the exception of King Buddha Loetla Nabhalai (Rama II) in 1809. After the Front Palace crisis in 1875, the title of Front Palace was abolished and replaced with the title of Crown Prince, who became heir apparent to the throne.

In 1924 King Vajiravudh (Rama VI) promulgated the 1924 Palace Law of Succession to regulate the succession, this law essentially barred females, children of commoner wives or children of foreign wives to the throne, it also re-affirmed Agnatic Primogeniture, or succession through the male-line by seniority. This law also affected the individuals who could become Crown Prince. Since its creation only three Princes have been raised to this title, so far only one has succeeded to the throne.

Crown Princes[edit]

Crown Princes of Thailand
Picture Name Relationship to monarch Mother Birth Receive title Ceased to be Crown Prince
Maha Vajirunhis.jpg Maha Vajirunhis Eldest son of King Rama V Queen Savang Vadhana 27 June 1878 14 January 1886[1] 4 January 1895
King Vajiravudh portrait photograph.jpg Maha Vajiravudh
(later King Rama VI)
Eldest son of King Rama V Queen Saovabha Phongsri 1 January 1881 4 January 1895[2] 23 October 1910
HRH Vajiralongkorn (Cropped).jpg Maha Vajiralongkorn Eldest son of King Rama IX Queen Sirikit 28 July 1952 28 December 1972[3] incumbent

Heirs to the throne[edit]

List of heirs apparent and heirs presumptive since 1886, those in bold succeeded to the throne as King.

Heirs to the Thai Throne
Heir Status Relationship to monarch Became Heir Ceased to be Heir Next in line of succession
(Relation to heir)
Date Reason Date Reason
Maha Vajirunhis.jpg
Maha Vajirunhis
Crown Prince Eldest son 14 January 1886 New creation 4 January 1895 Died of typhoid, age 17 Prince Vajiravudh, 1886–1895, half-brother Rama V
King Vajiravudh portrait photograph.jpg
Maha Vajiravudh
Crown Prince Eldest son 4 January 1895 Dead of previous 23 October 1910 Father died, became king. Prince Chakrabongse Bhuvanath, 1895–1910, brother
Chakrabongse Bhuvanadh.jpg
Chakrabongse Bhuvanath
Prince Brother Brother 23 October 1910 Brother became king 13 June 1920 Died of pneumonia, age 37 Prince Asdang Dejavudh, 1910–1920, brother Rama VI
Prince Asdang Dejavudh of Siam.jpg
Asdang Dejavudh
Prince Brother Brother 13 June 1920 Death of previous 9 February 1924 Died of nephrosis, age 36 Prince Chudadhuj Dharadilok, 1910–1923, brother
Prince Prajadhipok, 1923–24, brother
Prajadhipok's coronation records - 004.jpg
Prince Brother Brother 9 February 1924 Death of previous 25 November 1925 Brother died, became king Prince Mahidol Adulyadej, 1924–1925, half-brother
Prince Mahidol Adulyadej.jpg
Mahidol Adulyadej
Prince Brother Half-brother 25 November 1925 Half-brother became King 24 September 1929 Died of pneumonia, age 37 Ananda Mahidol, 1925–1929, son Rama VII
Young Prince Ananda Mahidol.jpg
Ananda Mahidol
Phra Ong Chao (1927) Nephew (son of Mahidol Adulyadej) 24 September 1929 Death of previous 2 March 1935 Abdication of uncle; became king Bhumibol Adulyadej, 1932–1935 brother
Bundesarchiv B 145 Bild-F009754-0001, Petersberg, Staatsempfang für König von Thailand (cropped for Rama IX).jpg
Bhumibol Adulyadej
Prince Brother Brother 2 March 1935 Brother became King 9 June 1946 Brother died, became King
Maha Vajiralongkorn "Incumbent". Only Son.
HRH Vajiralongkorn (Cropped).jpg
Maha Vajiralongkorn
Crown Prince (1972) Only Son 28 July 1952 Born
Dipangkorn Rasmijoti, 2005– son Rama IX

See also[edit]


Royal Gazette[edit]

  1. ^ Royal Gazette, Announcement of the appointment of Prince Vajirunhis to the Crown Prince of Siam (Thai), Volume 3, Chapter 44, 1 March 1886, page 368
  2. ^ Royal Gazette, The Investiture of Crown Prince Maha Vajiravudh (Thai), Volume 11, Chapter 63, 20 January 1895, page 346
  3. ^ Royal Gazette, Royal Decree announcing the Investiture of Crown Prince Maha Vajiralongkorn (Thai), Volume 89, Chapter 200 (ก), Special Edition, 28 December 1972, Page 1