Tatar [dá dá] is an eastern Mongolia unified by Dayan Khan in the early Ming Dynasty. In contrast to Wala, it is divided into Chahar, Tumote, Horqin, Erdos and Asu (Ossetians). China ancient northern nationalities with multiple meanings. The Tang Dynasty refers to the Tatar Department in the eastern part of the Mongolian Plateau. Tartars were first found in Turkic inscriptions and some Chinese records in the Tang Dynasty. The collapse of Turks and the westward migration of Uighurs have repeatedly provided Tatars with opportunities to move westward. From the Tang Dynasty to the Yuan Dynasty, there appeared the translated names of Dabi, Da Yue, Tatan, Tatar, Dada, Dada, etc., and the scope of their quotations varied with the times. It is a name shared by many ethnic groups, including nomadic people with Mongolian as one of their ethnic origins, and some Turks and their descendants who were once ruled by the Golden Horde in Europe. Today, one of the ethnic minorities in China, Tatars and Russian Tatars, both originated from the Tatars in ancient Mongolian grasslands. 1368, the Ming army captured Dadu, and the Yuan Dynasty's rule in the whole country ended. The Yuan regime retreated to Mobei, which was known as the North Yuan in history. 1402 Chen Yuangui Lichi usurped the throne to establish Tatar, and Mongolia was divided into Tatar and Wala.