The Khmer Empire was the third largest empire of South East Asia (after Srivijaya and Majapahit), based in what is now Cambodia. The empire, which seceded from the kingdom of Chenla, at times ruled over and/or vassalised parts of modern-day Laos,Thailand,Vietnam,Myanmar, and Malaysia. During the formation of the empire, Khmer had close cultural, political and trade relations with Java, and later with Srivijaya empire that lay beyond Khmer's southern border. Its greatest legacy is Angkor, which was the capital during the empire's zenith. Angkor bears testimony to the Khmer empire's immense power and wealth, as well as the variety of belief systems that it patronised over time. The empire's official religions included Hinduism and Mahayana Buddhism, until Theravada Buddhism prevailed after its introduction from Sri Lanka in the 13th century. Modern satellites have revealed Angkor to be the largest pre-industrial urban center in the world, larger than modern day New York.
The history of Angkor as the central area of settlement of the historical kingdom of Kambuja is also the history of the Khmer from the 9th to the 15th centuries.
From Kambujia itself - and so also from the Angkor region - no written records have survived other than stone inscriptions. Therefore the current knowledge of the historical Khmer civilization is derived primarily from:
