During the Ankgorian Period (802-1431), the Khmer Empire, by force of arms, extended its commonwealth to encompass vast areas of Southeast Asia. After a voluntary exile over a succession claim, Jayavarman returned to Kambuja in 1178 to help mitigate the damage done by the sack of Angkor by the Khmer Empire’s primary adversaries, the Chams from central Vietnam. In 1181, Jayavarman became king and raised an army, as standing armies seldom existed, and subsequently defeated the Cham in a great naval battle. After this first victory, he celebrated his coronation at Angkor. Immediately afterward, however, he was called upon to put down an uprising in the dependent Malyang. Jayavarman’s army subdued the rebels, and his commander, who was himself a Cham refugee from his own country, was selected to help him in the total conquest of Champa. In 1190, after exhaustive preparation, Jayavarman launched a great attack on Champa and was victorious. The son of Jayavarman VII, Prince In, was proclaimed king at Vijaya, and Champa became a vassal state of the Khmer Empire. Rebellions against the new regime were ubiquitous, but in 1203 the Khmer armies drove out the insurgents, and for seventeen years, 1203–1220, Champa was under Khmer domination. Although the death of Jayavarman VII is shrouded in mystery, he is thought to have died about 1215. Jayavarman VII. By Suzan Black, CC BY 3.0 (http://creativecommons.org/licenses/by/3.0), via Wikimedia Commons Statue of Jayavarman VII, at the Royal Palace in Phnom Penh, Cambodia. By Marcin Konsek, via Wikimedia Commons