When was the Mongolian Empire first founded?
History of Mongolia
The Mongols voluntarily reunified during Eastern Mongolian Tümen Zasagt Khan rule (1558–1592) for last time after the Mongol Empire. During the reign of Darayisung Gödeng Khan and his successor Tümen Jasagtu Khan, the right wings rose in the 16th century under a local lord Altan (son of Bars Bolad Jinong) who assumed the title of khan. In order to maintain the unity of the country by peaceful means, Tümen Jasagtu Khan initiated a representative government with equal participation of the representatives of the left and right wings. The right wings rivaled with the Oirats for possession of Upper Mongolia (Qinghai) and Altan Khan, who appointed his son as a ruler of Upper Mongolia (Kukunor), defeated the Oirats in 1552. Altan Khan attacked Ming China, but he stopped the raids in 1571, and signed a peace treaty with the Ming court. To achieve favorable conditions in the peace treaty with the Ming dynasty, Altan Khan occasionally threatened that he may ally with Tümen Khan to attack China. Altan Khan established the city of Hohhot in 1557. Hutuhtai Secen Hongtaiji of Ordos defeated the Torghuts at the river Irtysh around the 1560s.