Crown Prince of Thailand

The Crown Prince of Thailand (or Siam; ; ; lit. the royal son of Siam) is a title held by the heir apparent to the Thai throne. It was 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 royal succession. In 1688, King Phetracha 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 succeeded to the throne this way, with the exception of King Phutthaloetla Naphalai (Rama II) in 1809. After the death of Bowon 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 + Crown Princes of Thailand Picture Name Relationship to monarch Mother Birth Receive title Ceased to be Crown PrinceVajirunhisEldest son with queens of King Rama VQueen Savang Vadhana27 June 187814 January 1886Royal Gazette, Announcement of the appointment of Prince Vajirunhis to the Crown Prince of Siam (Thai), Volume 3, Chapter 44, 1 March 1886, page 368 4 January 1895(death)Vajiravudh(later King Rama VI)Third son with queens of King Rama VQueen Saovabha Phongsri1 January 18814 January 1895Royal Gazette, The Investiture of Crown Prince Maha Vajiravudh (Thai), Volume 11, Chapter 63, 20 January 1895, page 34623 October 1910(ascension) Vajiralongkorn(later King Rama X)Only son of King Rama IXQueen Sirikit28 July 195228 December 1972Royal Gazette, Royal Decree announcing the Investiture of Crown Prince Maha Vajiralongkorn (Thai), Volume 89, Chapter 200 (ก), Special Edition, 28 December 1972, Page 113 October 2016 (ascension)

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

Heirs to the Thai ThroneHeirStatusRelationship to monarchBecame heirCeased to be heirDuration as heirNext in line of succession(Relation to heir)Monarch Date Reason Date ReasonCrown Prince Maha VajirunhisHeir apparentEldest son with queens14 January 1886New creation a modern succession4 January 1895Died of typhoidPrince Vajiravudh, Prince of Ayutthaya1886–1895, younger half-brotherRama VCrown Prince Maha VajiravudhHeir apparentThird son with queens4 January 1895Elder half-brother died without children23 October 1910Father died; became kingPrince Chakrabongse Bhuvanath, Prince of Phitsanulok1895–1910, younger brotherPrince Chakrabongse Bhuvanath, Prince of PhitsanulokHeir presumptiveYounger brother23 October 1910Elder brother became king without children13 June 1920Died of pneumoniaPrince Asdang Dejavudh, Prince of Nakhon Ratchasima1910–1920, younger brotherRama VIPrince Asdang Dejavudh, Prince of Nakhon RatchasimaHeir presumptiveYounger brother13 June 1920Elder brother died without full Thai children9 February 1924Died of nephrosisPrince Chudadhuj Dharadilok, Prince of Phetchabun1910–1923, younger brotherPrince Varananda Dhavaj Chudadhuj1923–1924, nephewPrince Varananda Dhavaj ChudadhujHeir presumptiveNephew9 February 1924Uncle died without children2 September 1924Skipped by the royal commandPrince Prajadhipok Sakdidej, Prince of Sukhothai1924, unclePrince Prajadhipok Sakdidej, Prince of SukhothaiHeir presumptiveYounger brother2 September 1924Nephew was skipped26 November 1925Elder brother died without son; became kingPrince Mahidol Adulyadej, Prince of Songkla1924–1925, elder half-brotherPrince Mahidol Adulyadej, Prince of SongklaHeir presumptiveElder half-brother26 November 1925Younger half-brother became king without children24 September 1929Died of pneumoniaPrince Ananda Mahidol1925–1929, eldest sonRama VIIPrince Ananda MahidolHeir presumptiveHalf-nephew24 September 1929Father died2 March 1935Abdication of half-uncle without children; became kingPrince Bhumibol Adulyadej1929–1935, younger brotherPrince Bhumibol AdulyadejHeir presumptiveYounger brother2 March 1935Elder brother became king without children9 June 1946Elder brother died without children; became king Prince Paribatra Sukhumbandhu, Prince of Nakhon Sawan1935–1944, half-uncleRama VIIIPrince Chumbhotbongs Paribatra1944–1946, half-first cousinPrince Chumbhotbongs Paribatra, Prince of Nakhon Sawan IIHeir presumptiveHalf-first cousin 9 June 1946Half-first cousin became king without children28 July 1952Supplanted; Son born to kingPrince Sukhumabhinanda1946–1952, half-brotherRama IXCrown Prince Maha VajiralongkornHeir apparentOnly son28 July 1952 Born13 October 2016Father died; became kingPrince Chumbhotbongs Paribatra, Prince of Nakhon Sawan II1952–1959, half-first cousin once removedPrince Sukhumabhinanda1959–1974, half-first cousin once removedPrincess Maha Chakri Sirindhorn, Princess Royal1974–1978, younger sisterPrincess Bajrakitiyabha1978–1979, only daughterPrince Juthavachara Mahidol1979–1997, eldest sonPrincess Bajrakitiyabha1997–2005, eldest daughterPrince Dipangkorn Rasmijoti2005–2016, only recognised sonPrince Dipangkorn Rasmijoti Heir presumptive Only recognised son 13 October 2016 Father became king Princess Sirivannavari Nariratana2026-present, elder half-sister Rama XPrincess Maha Chakri Sirindhorn , Princess Royal , Aunt

Crown Prince of Thailand

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