Yokoyama Party

Japanese: 横山党 - よこやまとう

A group of warriors from the end of the Heian period to the early Kamakura period. They were a branch of the Yokoyama clan, based in Yokoyama, Musashi Province (present-day Hachioji City), and were one of the Seven Clans of Musashi. The Yokoyama clan claimed to be descendants of Ono no Takamura, and were also known as the Ono clan. The clan was based in the Tama River basin, and expanded into the Sagami River basin in Sagami Province. They followed Minamoto no Yoriyoshi in the Battle of Zenkunen, and Minamoto no Yoshitomo in the Hogen and Heiji Rebellions. When Minamoto no Yoritomo raised his army, Yokoyama Tokihiro and Yokoyama Tokikane, father and son, played an active role and became vassals. However, they were defeated after siding with Wada Yoshimori in the Wada War in 1213, and went into decline thereafter.
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Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

平安時代末期〜鎌倉時代初期の武士団。武蔵国横山（現八王子市）を本拠地とする横山氏の一族で，武蔵七党の一つ。横山氏は小野篁(たかむら)の子孫を称し，小野党ともいう。一族は多摩川流域に割拠し，相模国の相模川流域などにも進出。前九年の役では源頼義に，保元・平治の乱では源義朝に従った。源頼朝の挙兵時には横山時広・横山時兼父子が活躍して御家人となる。しかし1213年の和田合戦で和田義盛に与同して敗れ，以後衰退。
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