Goryeo was invaded through the Mongols in 7 key strategies with the 1230s until the 1270s, but was never conquered.[117] Exhausted following decades of combating, Goryeo sent its crown prince for the Yuan funds to swear allegiance on the Mongols; Kublai Khan approved, and married considered one of his daughters https://knox6ut3f.spintheblog.com/34325150/fascination-about-korea