Goryeo was invaded by the Mongols in seven main campaigns through the 1230s until eventually the 1270s, but was never conquered.[117] Exhausted following decades of combating, Goryeo sent its crown prince for the Yuan money to swear allegiance on the Mongols; Kublai Khan approved, and married one among his daughters https://reid3lk9v.articlesblogger.com/56450947/fascination-about-korea