Although the castellan of Nyūnomijō is not known to history, the territory was certainly under the suzerainty of the Nishina Clan, Nyūnomijō being a satellite fortification of Kibunejō. See my profile on Azumi Kibune Castle for more information.
Nyūnomijō was really interesting. I couldn’t find a map to guide me at the time so I was going in blind, but I found an earthworks castle ruin with many impressive features. Nyūnomijō is guarded to the mountainside rear by four horikiri (trenches that cut the ridge) in a row, with dorui (earthen ramparts) in between. Along the eastern side beneath the main bailey is a most wonderful Sengoku period mountaintop castle feature known as unejōtatebori, which is a series of tatebori (climbing trenches) arranged in a row one after the other. The shukuruwa (main bailey) is surrounded by dorui. Below the shukuruwa is the second bailey, and between the second bailey and the third bailey is a double trench system. The third bailey complex has many koshikuruwa (sub-baileys) spilling down the mountainside before it in a series of protective “U” shapes. This no-name site proved to be a solid yamajiro and I was quite happy with it. I hiked to the ruins of Nyūnomijō from Aokijō by carefully following a series of ridges. Even though there weren’t trails as such I met with no serious impediments.
|English Name||Nyuunomi Castle|
|Founder||Nishina Clan (probably)|
|Year Founded||Sengou Period|
|Castle Condition||Ruins only|
|Historical Period||Pre Edo Period|
|Artifacts||Horikiri, Dorui, Tatebori, Kuruwa, Koshikuruwa|
|Access||Shinano-Ômachi Station or Minami-Ômachi Station on the Ôito Line; 40 minute walk to trailhead|
|Visitor Information||24/7 free; mountain|
|Time Required||40 minutes|
|Location||Ômachi, Nagano Prefecture|
|Coordinates||36° 28' 35.90" N, 137° 52' 20.42" E|
|Added to Jcastle||2021|
|Admin Year Visited||Viewer Contributed|
|Friends of JCastle|