|Nankoku, Kōchi Prefecture, Japan|
Oko Castle 11.JPG|
Stone wall of Sannodan compound
Okō Castle (岡豊城 Okō-jō ) was a castle structure in Nankoku Kōchi Prefecture, Japan. Located on a 97-meter mountain. The site was designated a National Historic Site. It was the original base of power for the Chōsokabe clan who were feudal lords of Tosa Province and famous as the birthplace of the warlord Chōsokabe Motochika.
In 1508, Chōsokabe Kanetsugu came under attack by forces of local lords and he killed himself, his son Chōsokabe Kunichika narrowly escaped from the castle. Several years later Kunichika returned to the castle by Ichijō Fusaie`s help.
The castle is now only ruins, with low some stone walls, moats, and earthworks. Kōchi Prefectural Museum of History is on site. At the museum excavated artefacts from the castle are exhibited.
The castle was listed as one of the Continued Top 100 Japanese Castles in 2017.
- List of historic sites of Japan (Kōchi)
- "国史跡 岡豊城" (in Japanese). 高知県立歴史民俗資料館. http://www.kochi-bunkazaidan.or.jp/~rekimin/okou/castle.html. Retrieved 25 July 2019.
- "岡豊城" (in Japanese). 南国市観光協会. http://www.nankoku-kankou.jp/life/dtl.php?hdnKey=505. Retrieved 25 July 2019.
- "岡豊城跡" (in Japanese). じゃらん. https://www.jalan.net/kankou/spt_39204af2170018602/. Retrieved 25 July 2019.
- "岡豊城" (in Japanese). 攻城団. https://cmeg.jp/w/castles/8541. Retrieved 25 July 2019.
- "国史跡 岡豊城" (in Japanese). Nankoku city official. https://www.city.nankoku.lg.jp/life/life_dtl.php?hdnKey=1137. Retrieved 25 July 2019.
- "長宗我部 国親" (in Japanese). 戦国ヒストリー. https://sengoku-his.com/611. Retrieved 25 July 2019.
- "続日本100名城" (in Japanese). 日本城郭協会. http://jokaku.jp/japan-top-100-castles/best-100-castles-of-japan-2nd-selection/. Retrieved 25 July 2019.
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