Ayutthaya, the capital of the Thai Kingdom was found by U-Thong King in 1350. Ayutthaya as an island is formed by the gathering of three rivers, the Chao Phraya, the Pasak, and the Loburi and surrounded by rice terraces. It is easy to see why the Ayutthaya area was settled prior to this date since the site offered a variety of geographical and economic advantages. The Thai kings of Ayutthaya became powerful in the 14th and 15th centuries, taking over U-Thong, Lopburi, and Ayutthaya.