The Khmer Empire was a powerful kingdom based in what is now Cambodia. The empire, which succeeded from the kingdom of Chenla, at times ruled over and/or vassalised parts of modern-day Laos, Thailand and Vietnam. 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.
Chronological listing with reign, title and posthumous title(s), where known.