Narapatisimhavarman

Narapatisimhavarman (, ) is recorded in the Śrī Canāśa Inscription (K.949) as a ruler of Canasapura. cautions that the evidential base for Cānāśa is unusually narrow. The name is attested in this inscription and in the Bo Ika inscription alone, and in no literary source, and he describes the polity as a mystery that speculation cannot resolve. He adds that old Khorat lay on the routes later taken by Ayutthayan armies marching to the plateau, so the stone found at Ayutthaya may have been carried south at some later date. He succeeded his father, Sundararavarman, in 937 CE, by the Angkorian ruler Rajendravarman II in 946. In the aftermath of this campaign, the Angkorian monarch is reported to have installed "Vap Upendra" as his representative in the Rāmaññadesa in 949 CE, thereby subsuming Canasapura into the expanding Angkorian polity. The same designation recurs two generations later in the Khmer inscription K.1198, dated 1014, in which Suryavarman I charges his general Lakṣmīpativarman with the government of Rāmanya, glossed as a form of Rāmañña and taken to denote the Mon "who occupy the western region". This individual has been tentatively identified with Narapatisimhavarman, suggesting that he may have adopted a new titular designation following the Angkorian conquest, thereby continuing in a subordinate or redefined role within the regional hierarchy.

After the incorporation of Si Thep into the Angkorian sphere of influence, the city experienced a marked decline in both political authority and economic significance, while its former eastern satellite, , emerged as a more prominent regional center. Epigraphic evidence from this period attests to the activities of Mueang Sema elites, indicating the continued vitality of the area within the broader Angkorian polity. Nevertheless, after the reign of Jayavarman VII (r. 1181–1218), references to Angkorian presence or influence in the area disappear from the historical record.