According to some historical records, the temple was built during the reign of Somdet Phra Borom Rachathirat I. Later Somdet Phra Ramesuan enshrined the reliquary inside the foundation of the Prang, and this incident thus originated the temple’s name “Wat Mahathat” or “Wat Phra Sri Rattana Mahatat” which means the sacred temple where the relics of the Lord Buddha were installed. The Prang of Wat Mahathat was built in Early Ayutthaya. Its structure became the traditional model when constructing a temple and can be found nationwide