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Inamura-jō was a [[Muromachi period]] [[Japanese castle]] located in what is now the city of Tateyama, [[Chiba Prefecture]], [[Japan]]. The ruins have been protected as a National Historic Site since 2012 together with Okamoto Castle as the Satomi-shi shiro ato.
The layout of the castle was in a semicircle across the top of a curved ridge with a total length of up to 500 meters, making it by far the largest castle in Awa Province. The inner bailey was trapezoidal with a length of about 50 meters long, and protected by clay ramparts. Surrounding were many kuruwa constructed at various levels on the slopes, and protected by dry moats. The entrance into the castle was a complex gate with buffer area. (2025). 9784311750403, 学生社. ISBN 9784311750403
In 1516, Odawara-based Hōjō clan defeated the Miura clan and seized Miura Peninsula, opposite of Uraga Channel from Awa Province. Furthermore, the Hōjō expanded northward along Tokyo Bay, capturing Edo Castle by 1524. This threatened the Satomi clan from both the west and the north. In response, Satomi Yoshitoyo launched an amphibious invasion of Kamakura, in the process of which his forces burned down the famed Shinto shrine of Tsurugaoka Hachiman-gu. This was a massive loss of prestige for Yoshitoyo, and led to an internal conflict within the Satomi clan. Satomi Sanetaka, head of a cadet branch of the clan attempted a coup d'état with Hōjō assistance in 1533, but the attempt failed and he was killed. Yoshitoyo then attacked Sanetaka's son, Satomi Yoshitaka, but Yoshitaka escaped and together with the Hōjō and a strong navy, he managed to drive out Yoshitoyo and seize power the following year. Inamura Castle was abolished around this time.
No buildings or structures of the castle remains today. The site of the castle is currently being preserved and maintained by the local Inamura Castle Preservation Society, but there are no public facilities. The site is about a 10-minute walk from Kokonoe Station on the JR East Uchibo Line.
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