Jōkyū War
Ama was part of the ancient Oki Province, and the island consisted of a single district, also called Ama, and three villages. Emperor Go-Toba, defeated in the Jōkyū War in 1221, was exiled to the Oki Islands, and lived in Ama for 19 years until his death in 1239. Oki Shrine was built in 1939 to commemorate the 700th year of his death.