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In the second half of the 8th century, Nan-chao intervened frequently in the affairs of the principalities of the middle Mekong Valley, resulting in the occupation of Muang Sua in 709Events Saelred becomes king of Essex Ceolred becomes king of Mercia after his cousin Cenred abdicates to become a monk in Rome A storm separates the Channel Islands of Jethou and Herm Births Emperor Konin of Japan Deaths May 25 Aldhelm, bishop and scholar. Nan-chao princes or administrators replaced the aristocracy of Thai overlords. Dates of the occupation are not known, but it probably ended well before the northward expansion of the Khmer Empire under Indravarman I (r. 877-89) and extended as far as the territories of Sipsong Panna on the upper MekongThe Mekong is one of the world's major rivers. It is the 12th longest in the world, and the 10th largest by volume (discharging 475 km³ of water annually). It drains an area of 795,000 km²: from Tibet it runs through China's Yunnan province, Myanmar, Thai.
In the meantime, the KhmerThe 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 ts founded an outpost at Xay Fong near Vientiane, and ChampaThe kingdom of Champa (or Lin-yi in Chinese records) controlled what is now south and central Vietnam from approximately 192 AD through 1697. The empire began to decline in the late 15th Century, became a Vietnamese vassal state in 1697, and was finally d expanded again in southern Laos, maintaining its presence on the banks of the Mekong until 1070For alternate uses, see Number 1070. Events Hereward the Wake begins a Saxon revolt in the Fens of eastern England. Lanfranc, an Italian lawyer, becomes William's formidable Archbishop of Canterbury. Central Asian poet Yusuf Balasagun completed Kutadgu Bi. Chanthaphanit , the local ruler of Xay Fong, moved north to Muang Sua and was accepted peacefully as ruler after the departure of the Nan-chao administrators. Chanthaphanit and his son had long reigns, during which the town became known by the ThaiThe Thai language is the official language of Thailand. The Thai name for the language is phasa thai meaning "the language of Thais"). Thai is part of the Tai languages group of the Tai-Kadai language family. The Tai-Kadai languages are thought to have or name Xieng Dong Xieng Thong . The dynasty eventually became involved in the squabbles of a number of principalities. Khun Chuang , a warlike ruler who may have been a KammuKammu can refer to: Emperor_Kammu_of_Japan The Kammu language. (alternate spellings include Khamu and Khmu ) tribesman, extended his territory as a result of the warring of these principalities and probably ruled from 1128 to 1169. Under Khun Chuang, a single family ruled over a far-flung territory and reinstituted the Siamese administrative system of the seventh century. At some point, Theravada Buddhism was subsumed by Mahayana Buddhism.
Xieng Dong Xieng Thong experienced a brief period of Khmer suzerainty under Jayavarman VII from 1185 to 1191. By 1180 the Sipsong Panna had regained their independence from the Khmers, however, and in 1238 an internal uprising in the Khmer outpost of Sukhodaya expelled the Khmer overlords.
Xieng Dong Xieng Thong in 1353 became the capital of Lan Xang.