Kameyama Castle (Okayama)
{{short description|Castle in Okayama, Japan}}
{{Infobox military installation
| name = Kameyama Castle
| nativename-a={{lang|ja|亀山城}}
| partof =
| location = Higashi-ku, Okayama Prefecture, Japan
| image = Numa Kameyama Castle 02.JPG
| image_size =
| caption = Numa Castle / Kameyama Castle
| type = Okajiro-style castle
| height =
| ownership = Nakayama clan, Ukita clan
| controlledby =
| condition = ruins
| built = 16c
| builder = Nakayama Nobumasa
| used =
| materials =
| demolished = 1602
| battles =
| past_commanders = Nakayama Nobumasa, Ukita Naoie
| garrison =
| occupants =
| events =
| coordinates = {{coord|34|42|24|N|134|2|11|E|region:JP-13|display=inline,title}}
| map_type = Japan Okayama Prefecture#Japan
| map_size =
| map_caption =
| map_relief = 1
}}
{{nihongo|Kameyama Castle|沼城|Kameyama-jō}}, also well known as Numa Castle, is the remains of a castle structure in Higashi-ku, Okayama Prefecture, Japan. Its ruins have been protected as an Okayama City Designated Historic Site.
The castle was bulit by Nakayama Nobutada in the Tenbun period (1532–1555).{{cite web|URL=https://www.okayama-kanko.jp/spot/10172|title=沼城/亀山城|publisher=Okayama Tourism Association|language=ja|access-date=23 October 2021}} In 1559, Ukita Naoie killed Nakayama Nobumasa by order of Uragami Munekage. Then Naoie moved Ukita clan's main bastion from Shinjōyama castle.{{cite book|title=Nihon Jōkaku Taikei Vol.13 Hiroshima, Okayama|date=1980|publisher=新人物往来社|location=Tokyo|isbn=9784404009982|page=345}} Naoie expanded his territory based in the castle.{{cite web|URL=https://www.city.okayama.jp/museum/rekidai/ukita/naoie.htm |title=宇喜多直家|publisher=Okayama city official|language=ja|access-date=23 October 2021}}{{cite web|URL=https://www.city.okayama.jp/museum/joukan/04.html|title=沼城/亀山城|publisher=Okayama city official|language=ja|access-date=23 October 2021}} In 1570, Naoie started remodeling Okayama castle and moved from the castle in 1573.{{cite web|URL=https://kotobank.jp/word/%E5%AE%87%E5%96%9C%E5%A4%9A%E7%A7%80%E5%AE%B6-34359|title=Ukita Naoie|publisher=kotobank|language=ja|access-date=22 October 2021}}{{cite book|title=Nihon Jōkaku Taikei Vol.13 Hiroshima, Okayama|date=1980|publisher=新人物往来社|location=Tokyo|isbn=9784404009982|page=346}}
Soon after the Honnō-ji Incident, Hashiba Hideyoshi stopped and stayed in the castle on his way back to Kyoto to fight Akechi Mitsuhide's army.{{cite web|URL= https://shuchi.php.co.jp/rekishikaido/detail/3977|title=戦国屈指の強行軍。秀吉の中国大返し|publisher=歴史マガジンWEB|language=ja|access-date=25 October 2021}}