NOT KNOWN DETAILS ABOUT KOREA

Goryeo was invaded from the Mongols in seven key strategies within the 1230s until the 1270s, but was by no means conquered.[117] Exhausted soon after many years of battling, Goryeo despatched its crown prince to the Yuan capital to swear allegiance towards the Mongols; Kublai Khan acknowledged, and married one among his daughters on the Korean cro