Goryeo was invaded with the Mongols in 7 big strategies from the 1230s till 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 for the Mongols; Kublai Khan acknowledged, and married one among his daughters to your Korean crown prince,[117] plus the dynastic line of Goryeo ongoing to outlive underneath the overlordship of your Mongol Yuan dynasty to be a semi-autonomous vassal point out and Obligatory ally.

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