In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

The declaration that formally established this dynasty was made on Kulan Mountain. The first Westerner to discover their ruins was Henri Mahout, though stories of the elegance of its capital had been told much earlier by a visiting Chinese emissary, Zhou Daguan. Among the landmarks in its main capital were the temples Ta Prohm, the Baphuon, and Ta Keo, the first of which was made entirely from sandstone. A complex at Roulos formed the original capital of this empire, which expanded through its conquest of the Mon Kingdom and eventually that of Champa, though it would later fall itself to the Ayutthaya [ay-yut-THIGH-yuh]. Rajendravarman II, Suryavarman II, and the founder Jayavarman II were among the notable rulers of, FTP, what medieval empire of South Asia centered around Angkor in present-day Cambodia
History