Because the area embraces the isthmus mentioned above, the scrambles occurred to get the strategically vital mountain in the period of the Northern and Southern Courts or in the Onin War, and yamajiro (a castle built on a mountain to take advantage of the mountain's topography) was built on it.
上記のような地峡を扼する地であることから、南北朝時代(日本)や応仁の乱でも戦略上の要地として争奪の舞台となり山城も築かれた。