NOT KNOWN FACTS ABOUT KOREA

Goryeo was invaded through the Mongols in 7 important campaigns in the 1230s right until the 1270s, but was never ever conquered.[117] Fatigued immediately after a long time of fighting, Goryeo sent its crown prince towards the Yuan money to swear allegiance for the Mongols; Kublai Khan acknowledged, and married one among his daughters on the Korea