Crown Prince of Thailand

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Crown Prince of Thailand
Crown Prince's Standard of Thailand.svg

since 13 October 2016
StyleHis Royal Highness
AppointerKing of Thailand
Term lengthLife tenure or until accession as Sovereign
Inaugural holderVajirunhis
Formation14 January 1886

The Crown Prince of Thailand (or Siam; Thai: สยามมกุฎราชกุมาร; RTGSSayammakutratchakuman; lit. the royal son of Siam) 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 death of Bovorn Wichaichan in 1885, 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 three Princes have been raised to this title, and two have succeeded to the throne.

The title in Thai, Sayammakutratchakuman, comes from conjugation of the words Sayam (Siam), Sanskrit makut (meaning “crown”), ratcha from Sanskrit rāj, and kuman from Sanskrit kumār (meaning “son”).

Crown Princes[edit]

Crown Princes of Thailand
Picture Name Relationship to monarch Mother Birth Receive title Ceased to be Crown Prince
สมเด็จพระบรมโอรสาธิราช เจ้าฟ้ามหาวชิรุณหิศ สยามมกุฎราชกุมาร.jpg Maha Vajirunhis Eldest son of King Rama V Queen Savang Vadhana 27 June 1878 14 January 1886[1] 4 January 1895
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
(later King Rama X)
Eldest son of King Rama IX (only son) Queen Sirikit 28 July 1952 28 December 1972[3] 13 October 2016

Heirs-apparent and heirs-presumptive 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
สมเด็จพระบรมโอรสาธิราช เจ้าฟ้ามหาวชิรุณหิศ สยามมกุฎราชกุมาร.jpg
Maha Vajirunhis
Crown Prince Eldest son 14 January 1886 New creation 4 January 1895 Died of typhoid Prince Vajiravudh, half-brother Rama V

Maha Vajiravudh
Crown Prince Son 4 January 1895 Half-brother died 23 October 1910 Father died, became king. Prince Chakrabongse Bhuvanath, brother
Chakrabongse Bhuvanadh.jpg
Chakrabongse Bhuvanath
Hereditary Prince Brother 23 October 1910 Brother became king 13 June 1920 Died of pneumonia Prince Asdang Dejavudh, brother Rama VI
Prince Asdang Dejavudh of Siam.jpg
Asdang Dejavudh
Hereditary Prince Brother 13 June 1920 Brother died 9 February 1924 Died of nephrosis Prince Chudadhuj Dharadilok, 1910–1923, brother
Varananda Dhavaj, 1923–24, nephew
Emblem of the House of Chakri.svg
Varananda Dhavaj
Mom Chao Nephew 9 February 1924 Uncle died 2 September 1924 Skipped by the royal command. Prince Prajadhipok, uncle
Prajadhipok's coronation records - 004.jpg
Prince Brother Brother 2 September 1924 The prince was skipped 25 November 1925 Brother died, became king Prince Mahidol Adulyadej, 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 Ananda Mahidol, son Rama VII
King Ananda Mahidol portrait photograph 1944.jpg
Ananda Mahidol
Phra Ong Chao (1927) Nephew (son of Mahidol Adulyadej) 24 September 1929 Father died 2 March 1935 Abdication of uncle; became king Bhumibol Adulyadej, brother
King Bhumibol Adulyadej Portrait-1945.jpg
Bhumibol Adulyadej
Prince Brother Brother 2 March 1935 Brother became King 9 June 1946 Brother died, became King Prince Paribatra Sukhumbandhu, 1935–1944 uncle Rama VIII
Prince Chumbhotbongs Paribatra, 1944–1946 cousin
Emblem of the House of Chakri.svg
Chumbhotbongs Paribatra
Phra Ong Chao Cousin 9 June 1946 Cousin became king 28 July 1952 Son born to king Prince Sukhumabhinanda, half-brother Rama IX
HRH Vajiralongkorn (Cropped).jpg
Maha Vajiralongkorn
Crown Prince (1972) Only Son 28 July 1952 Born 13 October 2016 Father died, became King Prince Chumbhotbongs Paribatra, 1952–1959, first cousin once removed
Prince Sukhumabhinanda, 1959–1974, first cousin once removed
Princess Sirindhorn, 1974–1978, sister
Princess Bajrakitiyabha, 1978–1979, daughter
Prince Juthavachara, 1979–1997, first son
Princess Bajrakitiyabha, 1997–2005, daughter
Prince Dipangkorn Rasmijoti, 2005–present, son

Dipangkorn Rasmijoti 2019.jpg

Dipangkorn Rasmijoti

Chao Fa Youngest Son 13 October 2016 Father became king
Princess Bajrakitiyabha, half-sister Rama X

See also[edit]

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



  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
  4. ^ "Thai Crown Prince Maha Vajiralongkorn proclaimed king". BBC. 1 December 2016.