Assertion: empire's ruler | /r/HasProperty | king uthong
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Source sentences:
text: The first ruler of the Kingdom of Ayutthaya, King Uthong (r. 1351–1369), made two important contributions to Thai history: the establishment and promotion of Theravada Buddhism as the official religion to differentiate his kingdom from the neighbouring Hindu kingdom of Angkor and the compilation of the Dharmaśāstra, a legal code based on Hindu sources and traditional Thai custom.