From 1002 to 1182 A.D. kings belonging to the Suryavarman dynasty ruled supreme in Cambodia. Their empire extended over the whole of present-day Thailand. Being adherents of Mahayana Buddhism with a strong mixture of Brahmanism, the Suryavarman rulers did much to propagate and establish the tenets of the Northern School. There is an interesting stone inscription, now preserved in the National Museum at Bangkok, which tells us that in about 1017 A.D. (B.E. 1550) there ruled in Lopburi, in central Thailand and once a capital city, a king from Nakon Sri Thammarath who traced his ancestry to Srivijaya rulers. The king had a son who later became the ruler of Kambuja (Cambodia) and who, more or less, kept Thailand under the suzerainty of Cambodia for a long time. During this period there was much amalgamation of the two countries' religions and cultures. The stone inscription under consideration probably refers to one of the Suryavarman kings who had blood relationship with the Srivijaya rulers.