Goryeo was invaded by the Mongols in seven main campaigns with the 1230s right until the 1270s, but was by no means conquered.[117] Exhausted right after many years of fighting, Goryeo sent its crown prince on the Yuan cash to swear allegiance to the Mongols; Kublai Khan acknowledged, and married one among his daughters towards the Korean crown prince,[117] and the dynastic line of Goryeo ongoing to survive underneath the overlordship in the Mongol Yuan dynasty like a semi-autonomous vassal condition and compulsory ally.
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