In 1350 Prince U-Thong ordered a palace built in an area called Nong Sano, actual the
area in the vicinity of Bung Phra Ram. The palace contained three wooden buildings
named "Phaithun Maha Prasat", "Phaichayon Maha Prasat", and "Aisawan Maha
Prasat". Upon finalization of the palace in 1351, he established Ayutthaya as his capital
and was bestowed the title of King Ramathibodi I. The original size of the old palace
compound is believed to be the same as the area of Wat Phra Sri Sanphet today.