NOT KNOWN FACTS ABOUT KOREA

Goryeo was invaded from the Mongols in seven key strategies with the 1230s until the 1270s, but was by no means conquered.[117] Exhausted right after a long time of preventing, Goryeo despatched its crown prince to your Yuan cash to swear allegiance into the Mongols; Kublai Khan recognized, and married one of his daughters to the Korean crown princ