What led to the decline of the Koryo dynasty?

In the 13th century Koryŏ suffered from a series of invasions by the Mongols. King Kongmin (1352–74) 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.

Explanation:

In the 13th century Koryo suffered from a series of invasions by the Mongols.

Explanation:

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invasion from arab muslims