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King of Ayutthaya
King of Siam
Reign 1732–1758
Predecessor Thai Sa
Successor Uthumphon
Spouse Krom Luang Aphai Nushit
Krom Luang Phiphit Montri
House Ban Phlu Luang Dynasty
Father King Suriyenthrathibodi
Born Unknown
Died 1758
Ayutthaya, Ayutthaya Kingdom

Somdet Phrachaoyuhua Borommakot[1] (Thai: สมเด็จพระเจ้าอยู่หัวบรมโกศ) or Somdet Phra Boromaracha Dhiraj III (Thai: สมเด็จพระบรมราชาธิราชที่ 3) was the king of Ayutthaya from 1732 to 1758. His reign was the last blooming period of Ayutthaya as the kingdom would fall nine years after his death.

Prince Porn was the son of Phra Chao Suea. His elder brother, Prince Petch, succeeded the throne as Tai Sa in 1708. Porn was then appointed as the Front Palace. Upon the death of Tai Sa, however, Tai Sa decided to give his throne to his son, Prince Abhay, instead of his brother. In 1732, Tai Sa died and the civil war commenced. Porn led his armies against his nephews, Prince Abhay and Prince Poramet. The civil war was bloodshed and torn Ayutthaya apart. With the victory ensured, Porn executed his nephews and took the throne as King Boromakot.

Because the Samuha Kalahom had lent the support to Prince Abhay, Boromakot removed the power of Samuha Kalahom by depriving its authorities over southern Siam and transferred the power to Krom Tha instead. The Samuha Kalahom remained as a mere military figurehead.

In spite of the bloodshed that preceded his reign, Boromakot was known for his reconstruction of Buddhist temples and the peace and prosperity Ayutthaya finally enjoyed again. In 1753, Boromakot sent two Siamese monks to rehabilitate Theravada Buddhism in Sri Lanka.

In 1741, Boromakot made his son Dharmmadhibet the Front Palace. Dharmmadhibet proved to be an able prince and was a poet. However, Dharmmadhibet had affairs with two of Boromakot's concubines, Princess Sangval and Princess Nim - a severe crime. The lovers were caught in 1746 and the three were beaten. The Front Palace was lashed 120 stokes and the two concubines 30 each. The Front Palace died while he was beaten and Princess Sangval died 3 days later. Princess Nim survived, but she was banished from the court.

Boromakot then appointed his third son, Duea (later became Uthumporn), as the Front Palace. Boromakot skipped his second son, Ekatat, because he thought that Ekatat was not suitable to be a king. Ekatat always claiming his rights to the throne then and the struggles of princes for the throne would contribute to the fall of Ayutthaya in 1767 during the reign of Ekatat.


  1. ^ The Royal Institute. List of monarchs Ayutthaya. (Thai)
Preceded by
Sanphet IX
King of Ayutthaya
Succeeded by
Borommaracha Thirat IV
Preceded by
Chao Fa Porn
(Sanphet IX)
Front Palace
Succeeded by