new Chinese era name, Zhizheng (), was decreed to show this. Bayan's purges were called off. Many of the great Chinese literati came back to the capital from voluntary retirement or from administrative exile and the imperial examination system was restored. Toqto'a also gave a few early signs of a new and positive direction in central government. One of his successful projects was to finish the long-stalled official histories of the Liao, Jin and Song dynasties, which were eventually completed in 1345. Toqto'a resigned his office with the approval of Toghon Temür in June 1344, which marked the end of his first administration. The several short-lived administrations that followed from 1344 and 1349 would develop an agenda very different from Toqto'a's. In 1347, the emperor forced Toqto'a into Gansu with assistance from former officers of Kuśala and Yesün Temür. In 1349, Toghon Temür recalled Toqto'a, which began Toqto'a's second and very different administration. Late reign Since the late 1340s, people in the countryside suffered from frequent natural disasters, droughts, floods, and ensuing famines. The lack of effective government policy led to a loss of support from the people. Illicit salt dealers who were disaffected by the government's salt monopoly raised a rebellion in 1348, triggering many revolts around the empire. Among them was the Red Turban Rebellion, which started in 1351 and grew into a nationwide turmoil. In 1354, when Toqto'a led a large army to crush the Red Turban rebels, Toghon Temür suddenly dismissed him for fear of betrayal. This resulted in the restoration of Toghon Temür's power but also a rapid weakening of the central government. Thus he had no choice but to rely on the forces of local warlords. 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