April 3rd is regarded as the commemoration day for the establishment of Ayutthaya. People in Ayutthaya will make merit for King U-thong, the first King of Ayutthaya Era at the monument of King U-thong.

This monument was built in A.D. 1968 but the construction was completed and consecrated by His Majesty King Rama IX on Wednesday 24th June A.D. 1970. This monument is a sacred place that Ayutthaya people worship.

The monument is a statue in the standing position, molded with brass alloy, and treated to be in green colour. The right hand off the statue holds a machete. The statue has a top knot and wears a costume of a King in the early phase of Ayutthaya Era. The face to the statue slightly turns to the south towards Phra Ram Temple, which is believed to be the place where the body of King U-thong was cremated.

Location, On the city island, at the front of the entrance to Mongkhon Bophit Pantheon, next to Phra Si Sanphet Temple