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Tatar (simplified Chinese: 鞑靼; traditional Chinese: 韃靼; pinyin: Dádá; Mongolian: татар; Mongolian script: ᠲᠠᠲᠠᠷ; 1388 – 12 June 1635) was a general term used by the Han Chinese to refer to the nomadic peoples in the north. During the Ming dynasty, it specifically referred to the Eastern Mongols. In the early 15th century, the Mongolian tribes were divided into two major groups: the Eastern and the Western. The eastern part of the Mongolian grasslands was composed of tribes that were originally ruled by the Northern Yuan court. They were nomadic and inhabited both the northern and southern regions of the Gobi Desert. The Ming dynasty referred to them as "Tatars." The western part was inhabited by the Oirats, located in the northwest of the Mongolian Plateau. The "Tatars" were ruled by the Golden Family, descendants of the Yuan dynasty, or by other Mongol branches who were not direct descendants but still considered part of the original Mongol lineage. Their ancestors were the Black Tatars mentioned in the New History of Yuan. The Mongols who were referred to as "Tatars" by the Ming called themselves The Forty Tumens, and are also known as the Mongol heartland in modern times.
During that period, Eastern Mongolia was divided into various independent tribes. Later, it was further divided into the left and right wings. The left wing consisted of the Chahars, Khalkha, Uriankhai, and Khorchin tribes, while the right wing included the Yunshebuu, Ordos, Tumed, and Asud tribes.
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