The Shan States were a collection of Shan (Tai) principalities called möng whose rulers bore the title saopha (sawbwa). The term "Shan States" was first used during the British rule in Burma as a geopolitical designation for certain autonomous areas of Burma, analogous to the princely states of British India. The terms "Siamese Shan States" and "Chinese Shan States" were also used to refer to the Tai principalities in northern Thailand and southern Yunnan, which instead came under the suzerainty of the Kingdom of Siam or Qing dynasty.
Historical mention of the Shan states inside the present-day boundaries of Burma began during the period of the Pagan dynasty; according to the Tai chronicles, the first major Shan State of that era was founded in 1215 at Möng Kawng, followed by Möng Nai in 1223. These were part of the larger Tai migration that founded the Ahom Kingdom in 1229 and the Sukhothai Kingdom in 1253. Shan political power increased after the Mongols overran Pagan in 1287 and the Shans came to dominate many of the northern to eastern areas of Burma—from northwestern Sagaing Division to the present-day Shan Hills. The newly founded Shan States were multi-ethnic states that included a substantial number of other ethnic minorities such as the Chin, Palaung, Lisu, Pa-O, Kachin, Wa, and Burmans.