Ramathibodi becomes King of Siam.

Uthong

King of Siam from 1350 to 1369

King U-thong or King Ramathibodi I was the first king of the kingdom Ayutthaya, reigning from 1351 to 1369.

Monarchy of Thailand

The monarchy of Thailand is the constitutional form of government of Thailand. The king of Thailand is the head of state and head of the ruling Chakri dynasty.