Borommarachathirat I

Khun Luang Pha Ngua, King Borommarachathirat I (c. 1311–1388), was a lord of the Suphannaphum clan and elder brother of King Ramathibodi I's queen. When Ramathibodi founded Ayutthaya in 1351, he appointed Pha Ngua to rule Suphan Buri.

After Ramathibodi died in 1369 his son Ramesuan took the throne, but within a year Pha Ngua forced him to abdicate and was crowned himself. He died in 1388; his young son Thong Lan ruled barely a week before Ramesuan returned from Lavo and seized power.