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Was Korea ruled by Mongolia for 30 years before?

Korea was ruled by Mongolia for 30 years. The Yuan Dynasty ruled Korea. Korea was ruled by the Koryo dynasty in the Yuan Dynasty. At that time, Mongolian cavalry led by the Yuan Dynasty attacked the Koryo dynasty three times. The last time, the base camp of 20,000 Mongolian cavalry captured Kaijinbos, the capital of the Koryo dynasty. King Koryo surrendered to the Yuan Dynasty and gave Jeju Island aid to Korea.