Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. BatumÃ¶ngke Dayan Khan, was a Borjigin Khagan who reunited the Mongols under Chinggisid supremacy in Post-imperial Mongolia. Dayan Khan was enthroned as Great Khan of the Yuan Mongol Empire though his ancestor Toghan Temur failed to maintain Pan-Mongolism of the Mongol Empire a century before. He is remembered as one of the most glorious Mongolian Emperors. Dayan Khagan and his queen, Mandukhai, eliminated Oirat power and abolished the taishi system used by both local and foreign warlords. Dayan Khagan''s victory at Dalan Tergin reunified the Mongols and solidified their corporate identity as Chinggisid people. His decision to divide the Six tumens of Eastern Mongolia as fiefs for his sons created decentralized but stable Borjigin rule over Mongolia for a century. His reigning title, Dayan Khan, literally means Firm-eternal Oceanic Ruler (Khan)" in the Mongolian language. "