Mr. Oyamada

Japanese: 小山田氏 - おやまだうじ

A medieval samurai family whose main territory was Oyamada Manor in Tama County, Musashi Province. Descended from the Kanmu Taira clan and the Chichibu clan, Ariyoshi became the manor official of Oyamada Manor and was called Oyamada betto. Ariyoshi was in Kyoto when Minamoto no Yoritomo raised his army in 1180 (Jisho 4), so he followed the Taira clan and joined the army to pursue Kiso Yoshinaka. However, when the Taira clan fled to the west, he was pardoned and went east, becoming a vassal of the Kamakura shogunate after his sons Inage Shigenari and Hasutani Shigetomo. The family was entrenched in the southwestern part of Musashi Province, but after the death of Yoritomo, the Hojo clan, who were trying to control Musashi Province, first killed their relatives, the Hatakeyama clan, in 1205 (Genkyu 2), and then assassinated Inage Shigenari and Hasutani Shigetomo, causing the family's influence to decline drastically.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

武蔵国多摩郡小山田荘を本領とする中世の武家。桓武平氏秩父氏の流れをくみ，有重が小山田荘の荘官となって小山田別当と称したのに始まる。有重は1180年(治承4)の源頼朝挙兵時には在京していたため平家に従い，木曾義仲追討軍にも加わったが，平家西国落ちの際に許されて東下し，息子の稲毛重成，榛谷重朝らにはおくれて鎌倉御家人となった。一族は武蔵国南西部に蟠踞（ばんきよ）したが，頼朝死後，武蔵国を支配下におこうとする北条氏によって，1205年(元久2)まず同族の畠山氏が討たれ，続いて稲毛重成，榛谷重朝も謀殺されて，一族の勢力は極度に衰退した。

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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