 Later, King Ramathibodi I went on to make Theravada Buddhism the official religion of the kingdom of Ayutthaya.The ceremonial funeral chants at Wat Grong Greng are in Pali, the language of prayer of the Ceylonese Buddhist monastic community,
 members of which Ramkhamhaeng imported from Sri Lanka to teach Theravada Buddhism to his subjects in Thailand.Similar architecture can be found in Anuradhapura, Sri Lanka.