窝阔台
In 1231, Mongols under Ögedei Khan invaded Goryeo following the aftermath of joint Goryeo-Mongol forces against the Khitans in 1219. The royal court moved to Ganghwado in the Bay of Gyeonggi in 1232. The military ruler of the time, Choe U, insisted on fighting back. Goryeo resisted for about 30 years but finally sued for peace in 1259.