Wat Phra Si Thammarat or Wat Yai is in Phitsanulok Province. The temple is located on the east bank of the Nan River. It was built in the reign of King Lithai of the Sukhothai period. The temple houses the Phra Phuttha Chinarat, which is the most beautiful Buddha image in Thailand. The bronze image is in the attitude of subduing evil. Later, King Ekathosarot of the Ayutthaya period, gave gold to be beaten into gold-plating and put on the image. He did this himself. Phra Phuttha Phuttha Chinarat is in the west wihan of the temple. It has very beautiful door panels of inlaid - mother of pearl. The eastern wihas has Phra Attharot which is a stucco Buddha image. A large Prang is 36 metres high. There is a stairway that lead to the vault which houses the Lord Buddha's relic.