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.