Goryeo was invaded because of the Mongols in 7 important campaigns from the 1230s till the 1270s, but was never ever conquered.[117] Fatigued immediately after many years of battling, Goryeo despatched its crown prince into the Yuan cash to swear allegiance to the Mongols; Kublai Khan accepted, and married one https://trenton6kp6q.humor-blog.com/32880451/korea-secrets