Ayutthaya was a center of administraive power for the lower Chao Phraya Basin from 1350.
Originally there were 2 Kingdoms, Lavo Ayutthaya. Important ancient ruins of this prior period are Thammikkarat Temple.
There is also the works of art of the early U-Thong style.
King U-Thong commanded the construction of the new city in 1347 and it was founded in April 1350 and called Krung Thep Dvaravati Si Ayutthaya. This island city is detailed in the major places of interest link for Central Thailand.