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Situated on the banks of the Mae Nam Yom some 375 kilometers north of present-day Bangkok, Sukhothai was the cradle of Thai civilization, the place where its institutions and culture first developed. Indeed, it was there in the late thirteenth century that the people of the central plain, lately freed from Khmer rule, took the name Thai, meaning "free," to set themselves apart from other Tai speakers still under foreign rule.
The first ruler of Sukhothai for whom historical records survive was Ramkhamhaeng (Rama the Great, 1277-1317). He was a famous warrior who claimed to be "sovereign lord of all the Tai" and financed his court with war booty and tribute from vassal states in Burma, Laos, and the Malay Peninsula. During his reign, the Thai established diplomatic relations with China and acknowledged the Chinese emperor as nominal overlord of the Thai kingdom. Ramkhamhaeng brought Chinese artisans to Sukhothai to develop the ceramics industry that was a mainstay of the Thai economy for 500 years. He also devised the Thai alphabet by adapting a Khmer script derived from the Indian Devanagari script.
Sukhothai declined rapidly after Ramkhamhaeng's death, as vassal states broke away from the suzerainty of his weak successors. Despite the reputation of its later kings for wisdom and piety, the politically weakened Sukhothai was forced to submit in 1378 to the Thai kingdom of Ayutthaya.
Source: U.S. Library of Congress