Chonan clan

Japanese: 庁南氏 - ちょうなんうじ

A medieval samurai family in Kazusa. Also written as Chonan clan. In the Kamakura period, the Chonan clan was a branch of the Kazusa clan of the Kanmu Taira clan, but details are unknown. The Chonan clan, whose donor is recorded as "Kazusa Chubu Daifu Venerable Michitoshi Chonan Jiro Taira Tsunehide" on the ink inscription on the seated statue of Ryogen dated 1490 (Entoku 2) at Chofukujuji Temple (Sanzunodai, Chonan District, currently Chonan Town, Chosei District, Chiba Prefecture), is likely a descendant of the Chonan clan. In addition to the Chonan clan of Taira surname, the Chonan clan originated from the Takeda clan of Kai during the Muromachi and Sengoku periods. Namely, Nobunaga, the second son of Takeda Nobumitsu of the Kai Genji clan, built both Chonan and Mariyatsu castles in 1456 (Kōshō 2), and made Chonan Castle (currently Chonan, Chonan Town, Chosei District) his own castle and Mariyatsu Castle (currently Mariyatsu, Kisarazu City) his son Nobutaka's castle.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

上総の中世武家。長南氏とも書く。鎌倉時代，桓武平氏上総氏の一族に庁南氏がいるが詳細は不明。長福寿寺(長南郡三途台（さんずのだい）。現，千葉県長生郡長南町)蔵1490年(延徳2)良源座像墨書銘に，寄進者〈上総中務大輔沙弥道歳長南次郎平常秀〉と記されている庁南氏は，その後裔であろう。　この平姓庁南氏のほか，室町～戦国時代には甲斐武田氏出身の庁南氏が生まれる。すなわち甲斐源氏武田信満の次男信長は1456年(康正2)庁南･真里谷（まりやつ）両城を築き，庁南城(現，長生郡長南町長南)を自身の，真里谷城(現，木更津市真里谷)をその子信高の居城とした。

出典　株式会社平凡社世界大百科事典第２版について　情報

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