5 SIMPLE TECHNIQUES FOR KOREA

Goryeo was invaded because of the Mongols in 7 important campaigns in the 1230s until finally the 1270s, but was under no circumstances conquered.[117] Fatigued just after many years of fighting, Goryeo sent its crown prince towards the Yuan money to swear allegiance for the Mongols; Kublai Khan approved, and married considered one of his daughters