Koshibami Castle

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Home to the Koshibami Clan, Koshibamijō was caught between two feuding giants. The lord of the castle, Koshibami Miyauchi, capitulated to Takeda Shingen, but planned to betray him and join up with Uesugi Kenshin, and so Shingen ordered his death. Hagiwara Yaemon and Kosaka Danjō, along with a few dozen of their mounted troops, journeyed to Koshibamijō and lured out Lord Koshibami by offering to gift him horses. He was then bundled off to Zenkōji where he was executed. And they say not to look a gift horse in the mouth...

Visit Notes

Koshibamijō is a small castle ruin. There is a shukuruwa (main bailey) with a koshikuruwa (sub-bailey) half surrounding it below. A couple of pocket baileys strike off down the ridge from here. Dorui (earthen ramparts) surrounds parts of the shukuruwa, at the rear of which there is a karabori (dry moat) system, yokobori (lateral moat) or horikiri (trench) terminating in tatebori (climbing moats) at each end. Then there is a modern road, which may have been built over a double trench system. Beyond here is an empty field at slightly higher elevation which may have been a secondary bailey of the old castle.

  • Dorui 土塁

Castle Profile
English Name Koshibami Castle
Japanese Name 小柴見城
Alternate Names 小柴見砦
Founder Koshibami Clan
Year Founded Sengoku Period
Castle Type Mountaintop
Castle Condition Ruins only
Historical Period Pre Edo Period
Artifacts Kuruwa, Horikiri, Tatebori, Dorui, Koshikuruwa
Features trenches
Visitor Information
Access Nagano Station; 20 minute walk
Visitor Information Free; 24/7; Mountain
Time Required 30 minutes
Location Nagano, Nagano Prefecture
Coordinates 36° 38' 48.12" N, 138° 10' 29.60" E
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Added to Jcastle 2021
Contributor ART
Admin Year Visited Viewer Contributed
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