NOT KNOWN FACTS ABOUT KOREA

Goryeo was invaded because of the Mongols in 7 major campaigns from your 1230s right up until the 1270s, but was hardly ever conquered.[117] Fatigued after decades of combating, Goryeo sent its crown prince on the Yuan funds to swear allegiance to your Mongols; Kublai Khan recognized, and married one of his daughters to the Korean crown prince,[117