Ramathibodi I

Ramathibodi I (1314–1369), also known as Uthong, was the founder and first king of Ayutthaya, reigning from 1351 to 1369. He was the son of Baramaraja, a former prince of Si Satchanalai who became king of Ayodhya, and he succeeded his father in 1344.

In 1351 he founded Ayutthaya on an island in the Chao Phraya River, uniting Lopburi and Suphan Buri under one state. He also codified laws from Tai customs. After his death in 1369, the throne passed repeatedly between his son and his Suphannaphum brother-in-law.