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A lower Mekong River society called Funan is mentioned in Chinese records.
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Hindu Mekong kingdom of Khmers called Zhenla, or Chenla by the Chinese, take over Funan.
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King Jayavarnam II comes to power in 802 CE Chenla as a Hindu devaraja (god-king). He renames Chenla to Kambuja. King Jayavarman builds the Khmer Empire by uniting all states in the Angkor region. He established a new capital at Hariharalaya. By the time of his death (850 CE) the empire had grown alot. More temples, palaces and libraries had been built.
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A Cambodian temple dedicated to the Hindu god Shiva was built named Banteay Srei. Built by a Brahmin high priest, Yajnavaraha, during the time of Rajendravarman II rule.
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Suryavarman II in reign and the Angkor Wat, dedicated to Hindu god Vishnu, is built. Though during this time Buddhism becomes main religion in Kambuja.
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Chams, Hindu state in whats is now central Vietnam, invades and pillage the Angkor kingdom.
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Jayavarman VII, who defeats Chams, ascends to throne. He expandes the Khmer empire to the greatest extent, incorporating regions of present-day Laos, Burma, and Thailand. Jayarvarnam follows Mahayana Buddhism, begins building city of Angkor Thom with the Bayon Temple. During he's rule Jayavarman conducts series of battles between Cham, Thai and the Vietnamese, which the cost to maintain his army was expensive.
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After the death of King Jayavarman VII the Cham kingdom and Thais launch a series of attacks and pushes back the boundary of the Khmer. Buddhism grew in popularity during this time and the resources left from the Khmer were decreasing.
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Last Khmer king to use Angkor as the capital abandoned it.
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Capital moved to Phnom Penh.
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Thais defeat the Khmers and the Khmer Empire becomes a vassal state of the Thais.