Jeondeungsa, situated on Mount Jeongjok inside the walls of Samnangseong, or Samnang Fortress, is a the oldest Buddhist temple in Korea, established by Monk Adohwasang of Goguryeo when Queen Jeonhwa, during the reign of King Chunryeol (reign 1274~1308), donated a jade lantern to the temple. Jeondeungsa has many attractions including the Daeungjeon (main building), and the Yaksajeon (hall). Legend says the three sons of Dangun, the mythical founder of Korea, built this mountain fortress calling it Samnangseong or Jeongjoksan Fortress.