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Angkor is a region of Cambodia that served as the seat of the Khmer Empire, which flourished from approximately the ninth century to the thirteenth century. The word Angkor is derived from the Sanskrit nagara (नगर), meaning "city". The Angkorian period began in AD 802, when the Khmer Hindu monarch Jayavarman II declared himself a "universal monarch" and "god-king", until 1431, when Ayutthayan invaders sacked the Khmer capital, causing its population to migrate south to the area of Phnom Penh and are a UNESCO World Heritage Site.
The temples of the Angkor area number over one thousand. Angkor Wat, said to be the world's largest single religious monument. Many of the temples at Angkor have been restored, and together, they comprise the most significant site of Khmer architecture.