Khmer Empire

                                              (Red color is Khmer Empire)

                                               

The golden age of Khmer civilization, however, was the period from the 9th to the 13th centuries, when Khmer Empire, which gave Kampuchea, or Cambodia, its name, ruled large territories from its capital in the region of Angkor in western Cambodia.

Legend has it that in 802 CE, Jayavarman II, king of the Khmers, first came to the Kuhlen hills, the future site of Angkor Wat. Later, under Jayavarman VII (1181–ca. 1218), Khmer reached its zenith of political power and cultural creativity. Jayavarman VII gained power and territory in a series of successful wars. Khmer conquests were almost unstoppable as they raided home cities of powerful seafaring Chams. However, territorial expansion stopped after a defeat by Dai Viet. The battle also witnessed Suryavarman II's death. Following Jayavarman VII's death, Khmer experienced a gradual decline. Important factors were the aggressiveness of neighboring peoples (especially the Thai, or Siamese), chronic interdynastic strife, and the gradual deterioration of the complex irrigation system that had ensured rice surpluses. The Angkorian monarchy survived until 1431, when the Thai captured Angkor Thom and the Cambodian king fled to the southern part of the country. by wikipedia