The Historic Site of Anti-Mongolian Struggle (Korean: 항파두리 항몽 유적), also known as the Historic Site of Anti-Yuan Struggle and the Hangpaduri Hangmong Historic Site, is a protected area in Jeju Province, South Korea, that was once the location of an earthen fortress. This fortress, the Hangpadu/Hangpaduri Fortress (also written as Hangpadu(ri)seong), was built in 1271 by the Sambyeolcho rebels, who opposed the surrender by the Goryeo dynasty ruling Korea to the Yuan dynasty following the Mongol invasions of Korea. Built shortly after the Sambyeolcho took over the island of Jeju, the fortress soon became the capital of the rebellion after the Sambyeolcho were defeated elsewhere. Together with the Hwanhaejangseong coastal wall and various village fortifications, the fortress formed part of a defensive system to protect the island. After the Sambyeolcho forces were defeated by a combined Goryeo-Mongol invasion of 12,000 soldiers in 1273, the site eventually fell into disuse.
