Iinumajō was a satellite fortification of Mitojō, thought to have been built by Sakurai Sonbō during the Sengoku Period. It was controlled by the Sakurai Clan. The Sakurai served the Edo Clan who were lords of Mitojō. After the fall of Odawarajō to Toyotomi Hideyoshi, Hideyoshi's allies, the Satake Clan, with support from the Ōtomo Clan of Hitachi, attacked Mitojō, overwhelming it. Minor outlying fortifications, including Iinumajō, then fell in rapid succession. Iinumajō was destroyed in the conflict and not rebuilt.
Iinumajō is made up of a central enclosure with wings in the north and south. The north bailey is now the field of an elementary school and the southern bailey is a cemetery. To the east of the castle is the temple Fukushōji. Dorui (earthen embankments) surround the cleared central enclosure and run along in front of the side of the bailey where the entrance is, forming a barrier with the temple (now quite worn down). There is also an earthen mound in the middle of the central enclosure which may have some religious significance. This castle site is small but the adjacent temple is nice too.
|English Name||Iinuma Castle|
|Year Founded||Sengoku Period|
|Castle Condition||Ruins only|
|Designations||Local Historic Site|
|Historical Period||Pre Edo Period|
|Access||Accessible by car, nearest station is Iwama Station on the Joban Line|
|Visitor Information||Free, 24/7|
|Time Required||30 minutes|
|Location||Ibaraki-machi, Ibaraki Prefecture|
|Coordinates||36° 17' 22.27" N, 140° 23' 0.46" E|
|Added to Jcastle||2018|
|Admin Year Visited||Viewer Contributed|