NOT KNOWN DETAILS ABOUT KOREA

Goryeo was invaded by the Mongols in seven main campaigns through the 1230s right until the 1270s, but was never conquered.[117] Exhausted following a long time of combating, Goryeo despatched its crown prince on the Yuan funds to swear allegiance into the Mongols; Kublai Khan recognized, and married one of his daughters towards the Korean crown pr