Kanayama Castle
building in Ota, Gunma Prefecture, Japan
Kanayama Castle (金山城, Kanayama-jō) was a Sengoku period yamashiro-style castle located on top of Mount Kanayama in what is now Ōta, Gunma Prefecture, Japan. The site has been protected as a National Historic Site since 1990. The castle was also known as Ōta Kanayama Castle or as Nitta Kanayama Castle.
Background
Kanayama Castle is located on Mount Kanayama, a 200-meter-tall (660 ft) hill located to the north of central Ōta on the northern edge of the Kantō Plain, with two large rivers, the Tone River and Watarase River on either side. The location is a strategic point commanding the corridor from the eastern provinces to the northwest Kantō region.
History
Kanayama Castle was built in 1469 by the Iwamatsu clan, local warlords of the area. In 1528, one of their retainers, Yokose Narishige, (his family later changed their name to Yura), seized the castle and overthrew his overlord. The Yura clan expanded their influence in rapidly in Kōzuke Province seizing Kiryū Castle, Ashikaga Castle and Tatebayashi Castle, and rebuilding Kanayama Castle on a large scale. However, the Yura clan was hemmed in by much more powerful neighbors, especially the Uesugi clan to the north and the Hōjō clan to the south. Initially, the Yura pledged fealty to Uesugi Kenshin, but in 1566 changed their allegiance to the Hōjō.
Begin with the source’s own compact description: “Kanayama Castle” is building in Ota, Gunma Prefecture, Japan. The dossier treats that line as a proposition to test through Kanayama, Castle and building, not as a finished interpretation.
Why this record matters
The phrase “building in Ota, Gunma Prefecture, Japan” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Maps, plans, fabric surveys and administrative records can establish how the site’s name, extent and function changed over time. The source revision retrieved here is dated Jul 19, 2026. The linked authority identifier is Q1038062. Authority coordinates are 36.318, 139.377. 2 of 3 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank. The first chronological checks are 1990, 1469, 1528 and 1566.
Architectural summaries often privilege surviving fabric and can understate demolished phases, contested use or displaced communities. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Kanayama Castle” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.