taishi Bahamu's widow, Samar, persuaded the Khan to release her son, now named Toghan, to western Mongolia. However, in 1433, Toghan raised a rebellion and western Mongols finally crowned Toghtoa Bukha (or Toγtoγa Buqa) with the title of Tayisung Khan as their next khan, which resulted in half a decade of the simultaneous existence of two khans supported by opposing Mongol clans. Decline After two decisive campaigns in 1422 and 1423, Adai Khan lost all of the territory gained in the past and in 1430, the third Oirat victory wiped out his major strength, after which he could no longer mount any effective offensives and was forced on the defensive. Both sides attempted to utilize the stalemate to prepare for the next stage but Adai Khan could not recover from the previous loss. The Oirats soon launched another round of offensives and in the fourth decisive Oirat victory in 1434, Adai Khan’s major advisors, Arughtai, and others, were killed. Adai Khan’s downfall was certain. Death In 1438, Adai Khan was defeated in Ejene when his territory was overrun by the Oirats and their allies. Adai sought refuge in the Eight White Tents of Genghis Khan, however, being unarmed, he was murdered by Togoon taishi of the Oirat. See also List of khans of the Northern Yuan dynasty References 1390 births 1438 deaths Mongol khans Northern Yuan rulers 15th-century Mongol rulers 15th-century Chinese monarchs