Kublai Khan, the grandson of Genghis Khan and the founder of the Yuan Dynasty, took many people from Central Asia and made them work for him. One of these people was the Persian Muslim astronomer Jamal-ad-din (known in China as Zhamaluding). He proposed to the Khan that he could create a world map by combining many Chinese and Islamic maps of the world and create a world map. The result was Tianxia Dili Zongtu. Unfortunately this map has been lost by the ravages of time but we know for a fact that this is just one instance of Sino-Islamic cross-cultural fertilization that took place in this era.