Borommarachathirat I

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Borommarachathirat I
บรมราชาธิราชที่ 1
King of Ayutthaya kingdom
King of Siam
Reign 1370–1388
Predecessor Somdet Phra Ramesuan
Successor Somdet Phrachao Thong Lan
Died 1388
Issue Thong Lan
Full name
Somdet Phra Borommaracha I
Dynasty Suphannaphum Dynasty

Somdet Phra Borommaracha I (Thai: สมเด็จพระบรมราชาธิราชที่ 1, RTGS: Boromma Rachathirat I), Khun Luang Pa Ngua (Thai: ขุนหลวงพะงั่ว), or Baromaraja I (1370–1388) was the third king of Ayutthaya Kingdom.[1]:29 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 Sukhothai Kingdom (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.[2]

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


  1. ^ Chakrabongse, C., 1960, Lords of Life, London: Alvin Redman Limited
  2. ^ p. 431, 'The Collins Encyclopedia of Military History' (4th edition), Dupuy & Dupuy, 1993.
Borommarachathirat I
Born:  ? Died: 1388
Regnal titles
Preceded by
King of Ayutthaya
Succeeded by
Thong Lan