Mongol invasions of Korea
The Mongol invasions of Korea (1231–1259) comprised a series of campaigns between 1231 and 1270 by the Mongol Empire against the Goryeo dynasty. There were seven major campaigns at tremendous cost to civilian lives throughout the Korean Peninsula, the last campaign made Goryeo a vassal state of the Yuan dynasty for approximately 80 years. The Yuan dynasty would exact wealth and tributes from the Goryeo kings. Despite submission to the Yuan dynasty, internal struggles among Goryeo royalty and rebellions against Yuan rule would continue, the most famous being the Sambyeolcho Rebellion.