By the time of the accession of Khubilai Khan (Chinggis's grandson) as the Great Khan in 1260, the Mongols were ruling over a huge east–west empire stretching from Korea to Iraq and Russia. ‘The Mongols and the world: part 1’ looks at how the Mongols changed from conquerors to rulers. The khans in all the regions decided to rule rather than devastate. The regions consisted of four khanates who shared policies while also adopting and adapting practices and government agencies from the people they ruled. Despite differences and conflicts, the khanates controlled much of Asia and fostered economic, technological, and artistic relations among the regions. Khubilai Khan is the rule most associated with this period of cosmopolitanism.