The ancient origins of Thai law before the Sukhothai Period (A.D. 1238-1350) were influenced by the Hindu Code of Manu. During the Ayutthaya Period (A.D. 1350-1767), the modified Code of Manu, Called the Thammasat, along with the Rajasat, Which are rules developed from the actual decisions of kings in administering justice, formed the Thai legal system.