Wat Saket Ratcha Wora Maha Wihan (Thai: , usually short Wat Saket) is a Buddhist temple (Wat) in Pom Prap Sattru Phai district, Bangkok, Thailand.The temple dates back to Ayutthaya era, when it was called Wat Sakae. King Rama I renovated the temple and renamed it to Wat Saket.Phu Khao Thong (Golden mountain, ) is a steep hill inside the Wat Saket compound. It is not a natural outcrop, but an artificial hill.During the reign of King Rama III (1787 1851) the decision was made to build a Chedi of huge dimensions to add to the Wat Saket temple. However, the large Chedi collapsed during the construction process because the soft soil beneath would not support it. The resulting mud-and-brick hillock was left alone for about half a century, taking the shape of a natural hill and becoming overgrown with weeds. Since then it looked like a natural small mountain it received its name of "Phu Khao" ( ) at that time.