 Wat Phra Si Rattana Mahathat, known among the locals as "Wat Yai", was founded in 1357 by King Lithai of Sukhothai.The temple was built at the same time as Wat Phra Phuttha Chinna Si and Wat Phra Si Satsadaram.During the reign of King Ekathotsarot of Ayutthaya, its Buddha image was gilded and the temple was later developed by King Chulalongkorn and King Bhumibol Adulyadej of Rattanakosin.