Thailand · History · Easy
Answer: 14th century — Ayutthaya was founded in 1351 by King U Thong (Ramathibodi I) at the confluence of three rivers, growing into one of the world's largest and most cosmopolitan cities.
Ayutthaya was founded in 1351 by King U Thong (Ramathibodi I) at the confluence of three rivers, growing into one of the world's largest and most cosmopolitan cities.