In the early 1250s, Möngke Khan, grandson and successor of the mighty Mongol emperor, Genghis Khan, sent out his younger brothers Qubilai and Hulegu to consolidate his power. Hulegu was welcomed into Iran while his older brother, Qubilai, continued to erode the power of the Song emperors of southern China. In 1276, he finally forced their submission and peacefully occupied the Song capital, Hangzhou. The city enjoyed a revival as the cultural capital of a united China and was soon filled w...