History and Ethnic Relations
Emergence of the Nation. Evidence of an agricultural civilization with metallurgical capabilities has been found in northeastern Thailand; the earliest bronze artifacts date back to approximately 3,000 years ago. In the eighth and ninth centuries C.E., Mon states influenced by Indian civilization occupied portions of central and northern Thailand, where they were referred to as Dvaravati. In Thailand, the most important Mon center was Nakhon Pathom west of Bangkok. Mon influence declined in the eleventh century as the Khmer invaded the area from the east. The Khmer occupied only the Mon areas, but part of northeastern Thailand.
As early as the fifth or sixth century, Tai-speaking peoples began migrating from northern Vietnam and southern Yunnan into areas adjacent to the Mekong River. The Tai in northern Thailand came into contact with the Mon, who converted many of them to Theravada Buddhism. Tai speaking peoples gradually migrated southward and by the early eleventh century had moved into Mon territory. Tai peoples living in central Thailand came under Khmer control as the Khmer empire expanded. The Khmer referred to the Tai as Siams. The Tai in the vicinity of Sukhothai revolted against the Khmer rulers in 1238 and established a kingdom that promoted a writing system that formed the basis of modern Thai. In the wake of declining Khmer power, the center of Thai power shifted south to Ayutthaya, which was founded in 1351. In the north, the kingdom of Lan Na was founded in 1259. The Lao kingdom of Lan Sang was founded in 1353 and came include much of northeastern Thailand