Kai Genji

Japanese: 甲斐源氏 - かいげんじ

...After the 10th century, manors of nobles and temples and shrines were established in various parts of Kai, encroaching on the provincial government territory, but in the middle of the 12th century, there was a violent clash between Kii Kumano Shrine and the provincial government over Yatsushiro Manor, and the provincial government side was defeated in court (Chokan Kanbun). The Kai Genji clan rose to power based on these manors and the ranching area with the tradition of Kurokoma. Yoshikiyo and Kiyomitsu, the sons of Minamoto no Yoshimitsu, were driven out of Takeda-go in Hitachi Province around 1130 (Taiji 5) and settled in Ichikawa Manor in the province, and then advanced into the ranching area in the northern part of Koma County. ...

From the Seiwa Genji

...However, Yoshitsuna's line was wiped out during the Genji civil war. Yoshimitsu's lineage gave rise to the Satake clan of the Hitachi Genji and the Kai Genji (Takeda, Yasuda, Hemmi, etc.), while Yoshiie's son Yoshikuni's lineage gave rise to the Nitta clan of Kozuke and the Ashikaga clan of Shimotsuke.
[Establishment of the Samurai Government]
In the Hogen Rebellion of 1156 (the first year of the Hogen War), the Minamoto clan split into two factions: Tameyoshi (Yoshichika's eldest son) and his son Tametomo, who sided with Emperor Sutoku, and Yoshitomo (Tameyoshi's eldest son), who sided with Emperor Goshirakawa. Although Yoshitomo gained political status through his victory in battle, he lost most of his clan.

*Some of the terminology that refers to "Kai Genji" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…10世紀以後，甲斐でも各地に貴族や寺社の荘園が立てられ，国衙領を侵食していくが，12世紀の中ごろ，八代（やつしろ）荘をめぐって紀伊熊野神社と国衙との間に激しい衝突があり，裁判の結果国衙側が大敗するという事件も起きた(長寛勘文)。これら荘園や黒駒の伝統をもつ牧場地帯を根拠として甲斐源氏が勃興する。源義光の子義清･清光父子は，1130年(大治5)ごろ常陸国武田郷を追われて当国市川荘に土着し，さらに巨麻郡北部の牧場地帯へ進出した。…

【清和源氏】より

…しかし義綱の系統は源氏内紛の中で消滅した。また義光の系統からは常陸源氏の佐竹氏や甲斐源氏(武田氏･安田氏･逸見氏等)が出ており，義家の子義国の系統から上野の新田氏，下野の足利氏が成立した。
［武家政権の樹立］
　1156年(保元1)の保元の乱で源氏一門は崇徳上皇方に立った為義(義親の嫡男)やその子為朝らと，後白河天皇方に加わった義朝(為義の長子)とが敵味方に分かれて戦い，義朝は戦勝によってその政治的地位を高めたものの，一門のほとんどを失った。…

※「甲斐源氏」について言及している用語解説の一部を掲載しています。

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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