Goryeo was invaded through the Mongols in 7 important strategies from the 1230s until finally the 1270s, but was never ever conquered.[117] Fatigued just after many years of fighting, Goryeo sent its crown prince towards the Yuan money to swear allegiance on the Mongols; Kublai Khan approved, and married considered one of his daughters into the Korean crown prince,[117] and the dynastic line of Goryeo continued to survive under the overlordship from the Mongol Yuan dynasty as being a semi-autonomous vassal state and compulsory ally.
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