Wat Phra Si Sanphet was situated on the premises of the royal palace which had been established in the reign of King Ramathibodi I (King U – Thong). In 1448 King Boroma-Tri-Loka-Nat dedicated the site of the palace to the construction of the temple. The important edifices in this temple are the three main stupas containing the ashes of King Boroma-Tri-Loka-Nat, King Boroma-Rachathirat III and King Ramathibodi II. It was a royal temple Kingdom of Ayutthaya, used for such important royal ceremonies as swearing allegiance and it also served as the royal family’s private chapel and the place where the royal family’s ashes were preserved. No monks resided here though they were occasionally invited for particular rites. In 1499, a principal Viharn (hall of worship) was built. The following year, in 1500 A.D., King Ramathibodi II, commanded the casting of a standing Buddha image 16 meters in height and covered with gold. This image, Phra Buddha Chao Si Sanphet, was the main object of veneration in the royal Viharn. After that time the ashes of members of all royal family members and other the kings were placed in small chedis constructed at the site The royal palace can also be accessed from the same entrance at Wat Phra Si Sanphet, but it only has a few free standing buildings remaining.