Dayan Khan () (given name: Batumöngke; 1464–1517/1543) was a Mongol khan who reunited the Mongols under Chinggisid supremacy in the Northern Yuan Dynasty in Mongolia. His reigning title, "Dayan", means the "Great Yuan" (大元), as he enthroned himself as Great Khan of the Great Yuan, though the Yuan Dynasty, the principal khanate of the Mongol Empire, had already been overthrown by the native Chinese Ming Dynasty in China a century ago (1368). He is remembered as one of the most glorious Mongolian Emperors.