NOT KNOWN FACTS 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 a long time of preventing, Goryeo despatched its crown prince into the Yuan cash to swear allegiance to the Mongols; Kublai Khan accepted, and married certainly one of his daughters for the Korean cr