Soga clan

Japanese: 曾我氏 - そがうじ

A medieval samurai family whose main territory was Soga-sho in Sagami Province. Genealogically, they belonged to the Chiba clan, a branch of the Kanmu Heishi clan, but the descendants of Sukeie, who was the first to claim to be Soga, all share the character "Suke" and their descendants, who later moved their base to Mutsu Province, inherited territories in Izu. Considering these facts, it can be said that the family had closer ties to the powerful Ito clan of Izu than to the Chiba clan, whose base was in Shimousa. The woman who became the wife of Sukeie's son Sukenobu was the mother of the Soga brothers, who were famous for their revenge. The Soga brothers' biological father was Kawazu Sukeyasu of the Ito clan, but after Sukeyasu's death, their mother married a Soga man, and so the Soga brothers, who were born by marriage, also took the name Soga.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

相模国曾我荘を本領とする中世武家。系譜の上では桓武平氏の一流千葉氏に属するが，はじめて曾我を称した祐家以下の子孫が〈祐〉の1字を共有していることや，のちに陸奥国に拠点を移した子孫が伊豆に所領を相伝していることなどから考えると，下総に本拠をおく千葉氏よりも，伊豆の雄族伊東氏と縁の深い一族であったといえる。祐家の子祐信の妻に迎えられた女性が，仇討で有名な曾我兄弟の母である。曾我兄弟の実父は伊東一族の河津祐泰であるが，祐泰の死後母親が曾我に嫁したため，その連れ子である兄弟も曾我を称したのである。

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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