"Yuan Invasion of Goryeo" . "Zhengdong Province" . "Yuan Empire" . "Son-in-law state" . "Vassal state" . "vassaldom" . "son-in-law state" . "Goryeo was under Mongol rule" . . "son-in-law nation" . . . "Korea" . "Yuan rule" . "Korea under Yuan rule" . . "rule over Goryeo" . "political domination" . "Mongol-Koryo" . "forced intermarriage" . . "Mongol rule" . "Mongol domination in Korea" . . . . "Goryeo dynasty" . "Goryeo under Mongol rule" . "semi-autonomous region" . "ruled only indirectly by the Mongols" . "Goryeo" . "Goryeo under Mongol rule" . "under the overlordship" . "Yuan invasion" .