Goryeo was invaded because of the Mongols in 7 important campaigns in the 1230s until finally the 1270s, but was never ever conquered.[117] Fatigued immediately after many years of battling, Goryeo sent its crown prince to the Yuan capital to swear allegiance towards the Mongols; Kublai Khan acknowledged, and married among his daughters on the Korean crown prince,[117] along with the dynastic line of Goryeo ongoing to outlive beneath the overlordship with the Mongol Yuan dynasty for a semi-autonomous vassal point out and Obligatory ally.
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