The  weight of years will bear down on each of us heavily, from the humblest farmer to the most august monarch. And Khubilai Khan, mighty even among the mighty, over his nearly forty year reign found even his immense energies sapped by this burden. Age, grief, the rigours of government, and military defeats ground down the vision of Khubilai, and in reaction he directed his energies to drink and food. In the vacuum left behind, corruption grew like mold on the young Yuan Dynasty, sowing problems neither Khubilai nor his successors would be able to solve. Today, we look at the last years of Khubilai Khan, the end of an era in the Mongol Empire: I’m your host David, and this is Kings and Generals, Ages of Conquest.       For the past few episodes, we have dealt with Khubilai’s long reign. First, we dealt with his conflict with his brother Ariq-Boke for the Mongol imperial throne. Khubilai was victorious by 1264, but in his victory was left with hardly even a nominal mastery over the western Khanates of the empire: the Golden Horde, Chagatai Khanate, Ilkhanate and Ogedeid Khanate under Qaidu were all effectively independent powers by the time of Khubilai’s victory. As a result, Khubilai focused his attention on China. Over three episodes we detailed Khubilai’s renewed effort to end the long war with the Song Dynasty, a victory finalized by 1279 which marked the conquest of China, almost 60 years since Chinggis Khan had first attacked the Jin Dynasty. Then, we looked at Khubilai’s efforts to build his administration from 1264-1279, the period of his greatest energy and vision. By all standards, Khubilai was an impressive monarch, merging Mongolian and Chinese imperial traditions into a carefully balanced new system which, in many areas, seems to have genuinely sought to reduce the burdens upon Khubilai’s subject population. Our following episodes dealt with the beginning of the end of Khubilai’s good fortune. In Japan, Vietnam, Myanmar and Java, Khubilai’s military forces met with either inconclusive, or outright diastrous results. A stunning expenditure of resources and lives for little  in the way of strategic gains, the efforts to meet these costs required imaginative efforts on the part of Khubilai’s finance ministers- the topic of our previous episode, looking at the so-called Three Villianous ministers, Ahmad, Lu Shih-jung and Sangha, and the animosity they inspired from the top levels of Khubilai’s government to the subject population.    For Khubilai, the successive defeats were not just a shock in comparison to the overwhelming victories over the previous decades, but were more alarming in a personal manner. In both the Mongolian and Chinese imperial traditions, the right to rule rested on the support of Heaven. Heaven’s support always manifested itself in bountiful harvests, good climates, good governance and military victories. For the Mongols, the many amazing conquests of the thirteenth century had demonstrated Eternal Blue Heaven’s desire for the Mongols to rule the whole of the world.  Khubilai had firmly believed that the ultimate destiny of the Mongols, and his destiny, was that his rule would include everything beneath the blue sky. There  simply could not have been an alternative to this. So to be met with the alternative; that is, successive rounds of wasteful defeats in foreign countries from the late 1270s through the 1290s, must have come not just as an immense shock, but  a blow to Khubilai’s own psyche. Coupled with the knowledge of his loss of control over the Khanates in the west of the empire, and the rebellion he faced within and along his borders, Khubilai would have struggled with a sense of failure; his failure to complete the mission begun by his grandfather, great Chinggis Khan. Aside from defeats and failure in his foreign policy, the internal matters of Khubilai’s realm  also saw the failure of many of his efforts to actually run his empire, and failures in his personal life.       After 1276, t