Chahar (Mongols) in the context of "Dayan Khan"

Zasagt Khan (Mongolian: Засагт Хаан; Chinese: 扎薩克圖汗), born Tümen (Mongolian: Түмэн; Chinese: 圖們) (1539–1592), was a khagan of the Northern Yuan dynasty, reigning from 1558 until his death in 1592. He succeeded Darayisung Gödeng Khan and ruled directly over the Chahar. During his reign, the Mongols conquered the Daur and Evenk tribes.

Zasagt Khan was the first of three sons of Darayisung Gödeng Khan. His authority was validated by Altan Khan, and he later coordinated Altan's actions to win over the Uriyangkhai and Daur Mongols. His relatives, Abtai Khan and Khutughtai Sechen Khung Taiji, brought a significant portion of the Four Oirats back into the Mongol fold. In addition to conducting successful raids against the Ming dynasty, Zasagt Khan conquered Koko Nur and appointed his son as its ruler.

Chahar (Mongolian: ᠴᠠᠬᠠᠷ/ Чахар; Chinese: 察哈爾; pinyin: Cháhā'ěr), also known as Chaha'er, Chakhar or Qahar, was a province of the Republic of China in existence from 1912 to 1936, mostly covering territory in what is part of Eastern Inner Mongolia. It was named after the Chahar Mongols.
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