How did the mongols change the koryo dynasty?

answer:

in the 13th century koryŏ suffered from a series of invasions by the mongols. king kongmin   attempted a set of reforms to drive out the invaders and eliminate their influence from the court, but without success. finally, in 1392, the newly emerged confucian scholar gen. yi sŏng-gye overthrew the shaky dynasty and founded the chosŏn (yi) dynasty

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