Borommarachathirat I

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Borommaracha I (Thai: สมเด็จพระบรมราชาธิราชที่ 1, RTGS: Boromma Rachathirat I) or Khun Luang Pa Ngua (Thai: ขุนหลวงพะงั่ว) (1370–1388) was the third king of Ayutthaya Kingdom. His name Khun Luang Pa Ngua literary means the fifth prince.

As the lord of Suphanburi, a powerful rival of Ayutthaya, he forced King Ramesuan from power and took the throne of Ayutthaya. Known as a great warrior, his reign marked the expansion of Ayutthaya to the north. He suppressed a rebellion in Sukhotai (1371-78) and subjugated major northern powers such as Phitsanuloke. Invading Chiengmai, his forces were defeated and repulsed at the Battle of Sen Sanuk, near Chiengmai.[1]

After his death in 1388, his son, Thonglun reigned for only a week. Ramesuan, who had previously retreated to Lopburi, returned and toppled him. Ramesuan eventually assumed the throne, as the king for the second time.


  1. ^ p. 431, 'The Collins Encyclopedia of Military History' (4th edition), Dupuy & Dupuy, 1993.