Kököchin, also Kökechin, Kokachin or Cocacin (Ch: 阔阔真), was a 13th-century Mongol princess from the Yuan dynasty in China, belonging to the Mongol tribe of the Bayaut (Ch: 伯牙吾). In 1291, she was betrothed to the Ilkhanate khan Arghun by the Mongol Great Khan Kublai. This followed a request by Arghun to his grand-uncle Kublai, follow...