Hōjō Sōun who had been fighting with the
Miura clan built the castle to avoid being attacked from behind by the Ōgigayatsu Uesugi clan's relief army. During the
siege of Odawara in 1590,
Hōjō Ujikatsu entrenched himself in the castle but was besieged by a big army of the
Tokugawa Ieyasu. There are little remains of the castle on the present day site, just some moats and earthworks. Excavated artefacts from the castle are exhibited at
Ryūhō-ji Temple near the castle. ==Access==