Thai Sa

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Thai Sa
King of Ayutthaya
King of Siam
Ayutthaya, Ayutthaya Kingdom
SpousePrincess Rachanurak
Issue9 sons and daughters
HouseBan Phlu Luang dynasty
FatherKing Suriyenthrathibodi

Thai Sa (Thai: ท้ายสระ, pronounced [tʰáːj sàʔ]) or Sanphet IX (Thai: สรรเพชญ์ที่ ๙) was the King of Ayutthaya from 1709 to 1732 and the third ruler of the Ban Phlu Luang Dynasty.[1]:xix,277


King Thai Sa was born Prince Surinthrakuman[2] (Thai: พระสุรินทรกุมาร) to King Suriyenthra and his principal queen. After the death of his father in 1709 Prince Surinthra Kuman was crowned as King of Siam and took the reigning name Phumintharacha (Thai: ภูมินทราชา). He appointed his brother Prince Voraraj as the Front Palace. The king was said to be very fond of silver barb that he forbade anyone but himself from fishing them or else they would be fined. This earned him the epithet King of the Backyard Pond or King Thai Sa. His reign was marked by the building of many canals, and "large sea-going vessels". Siam also exported many live elephants.[3]:67

Invasion of Cambodia[edit]

In the early reign of King Thai Sa, there was a royal succession conflict in Cambodia. Prince Ang Tong and his younger brother, Prince Keao Fa, were fighting for the throne of Cambodia. In 1715, Nguyễn Phúc Chu the Nguyen lord who supported King Keao Fa III invaded Oudong and King Thommaracha III and Prince Ang Tong along with their families fled to Ayutthaya for protection. King Tai Sa ordered Chao Phraya Chakri to invade Cambodia[4] to restore King Thommarcha in 1717. The Siamese fleets suffered defeat by the Vietnamese at Banteay Mas yet on the land the Siamese were able to reach Oudong in 1718 and eliminated Vietnamese troops in the city. King Keao Fa, however, took negotiating measures. He agreed to pay tribute to the Siamese court as Ayutthaya's vassal state in exchange for the Siamese's acknowledgment of him as the legitimate king of Cambodia.

Succession crisis[edit]

King Thai Sa had three sons - Prince Narenthon, Prince Aphai and Prince Poramet. In 1732, while King Thai Sa was on his deathbed he gave the throne to Prince Aphai since Prince Narenthon, his elder brother had entered the priesthood. The two remaining princes rose in armed rebellion against their uncle. Prince Phon, the younger son of Suriyenthrathibodi managed to defeat his nephews and took the throne as King Borommakot.[1]:280–281


# Consort and Concubines Children
1. Thongsuk, Princess Rachanurak Princess Thep
Princess Prathum
Narenthon, Prince Surenthra Phithak
Prince Aphai
Prince Poramet
Prince Thap
2. Others Prince Settha
Prince Prik
Princess Sombunkhong


  1. ^ a b Rajanubhab, D., 2001, Our Wars With the Burmese, Bangkok: White Lotus Co. Ltd., ISBN 9747534584
  2. ^ Ayudhayan affidavit (คำให้การชาวกรุงเก่า)
  3. ^ Chakrabongse, C., 1960, Lords of Life, London: Alvin Redman Limited
  4. ^ Cambodian Chronicles
Thai Sa
Born: 1678 Died: 1733
Regnal titles
Preceded by
Sanphet VIII
King of Ayutthaya
Succeeded by