The Gosannen War (後三年合戦, gosannen kassen), also known as the Later Three-Year War, was fought in the late 1080s in Japan's Mutsu Province on the island of Honshū.
The Gosannen War (後三年合戦, gosannen kassen), also known as the Later Three-Year War, was fought in the late 1080s in Japan's Mutsu Province on the island of Honshū.