Toghon Temür
Toghon Temür gradually lost interest in politics and ceased to intervene in political struggles. His son Biligtü Khan, who became Crown Prince in 1353, attempted to seize power and came into conflict with Toghon Temür's aides, who dominated politics instead of the khan. During this time power was increasingly exercised by Lady Ki. Chief Empress Lady Ki and his minister persuaded Biligtü Khan to overthrow the latter. Toghon Temür was unable to conciliate the dispute but executed the minister. In 1364 the Shanxi-based warlord Bolad Temür occupied Khanbaliq and expelled the Crown Prince from the winter base. In alliance with the Henan-based warlord Köke Temür, Biligtü Khan defeated Bolad Temür in the next year. This internal struggle resulted in further weakening of the political and military power of the central government. In 1365, Toghon Temür finally promoted his much beloved Lady Ki to First Empress and announced that his son by her would be the first in the line of succession.