Kagamiyama Fort

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Kagamiyama-toride was built as a satellite fortification of Hadanashijō in the valley below in the 14th century. It was likely used as a fortified look-out and emergency redoubt. See Hadanashijō for more information.

Visit Notes

Kagamiyama-toride is a yamajiro (mountaintop castle) ruin in Hadanashi Township, Okazaki Municipality. Ruins include baileys, trenches and other earthworks.

There are some cleared areas I took for baileys. One had dorui (earthen ramparts) banked up on one side. There was what looked to be a terraced dry moat above this bailey. The bottom of each half-man height terrace was lined with stones. This site seems old, and the layout was difficult to make sense of.

Just to be thorough I climbed up past the site of the ruins and came across what appeared to be a large boulder split cleanly in half, as though some bodhisattva had cleft it in twain with a fiery sword. It occured to me that these smooth rock faces might have been interpreted as mirrors, giving the castle-mount its name. The peak is above these boulders. I couldn't go to the very top because it was too overgrown, but I came across what seemed like stretch of dorui guarding the approach to the peak .


Castle Profile
English Name Kagamiyama Fort
Japanese Name 鏡山砦
Founder Ao Clan
Year Founded 14th Century
Castle Type Mountaintop
Castle Condition Ruins only
Historical Period Pre Edo Period
Artifacts Dorui, Karabori, Kuruwa, &c.
Features trenches
Visitor Information
Access Nearest station is Miai Station on the Meitetsu-Nagoya Line
Visitor Information 24/7 free; mountain
Time Required 30 minutes
Location Okazaki, Aichi Prefecture
Coordinates 34° 56' 49.09" N, 137° 14' 30.55" E
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Added to Jcastle 2024
Contributor ART
Admin Year Visited Viewer Contributed
Friends of JCastle
Jōkaku Shashin Kiroku
Shiseki Tanbōki
Aichi Shiro

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