Mr. Hirayama

Japanese: 平山氏 - ひらやまうじ

A medieval samurai family whose main territory was Hirayamago in Musashi Province. A leading branch of one of the Seven Musashi Party Western Parties, its ancestor was Sueshige (one theory says Naosue). As a member of the Minamoto clan, Sueshige played an active role in the Hogen and Heiji Rebellions, and later joined Minamoto no Yoshitsune's army in pursuit of the Taira clan, achieving numerous military feats. However, because Sueshige and Yoshitsune were appointed to official positions without Minamoto no Yoritomo's permission, Yoritomo scolded them, saying, "It is an unprecedented appointment to an official position, with a carefree face." His descendants sided with the Wada side in the Wada War of 1213 (Kenpo 1), and fell into decline. Later, in the Muromachi period, Hirayama Mikawa Nyudo, who appeared as a leading and powerful local lord in the Bushu Southern Rebellion, which was under the influence of the Kanto Kanrei Uesugi clan, was probably a descendant of the Sueshige clan.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

武蔵国平山郷を本領とする中世武家。武蔵七党西党の一流で，季重(一説直季)を祖とする。季重は源氏家人として保元･平治の乱に活躍，のち源義経の平家追撃軍にも加わって数々の戦功をあげた。しかし義経らとともに源頼朝の許可なく任官したため，頼朝から〈顔ハフワフワトシテ希代ノ任官哉〉とののしられ処罰を受けた。その子孫は1213年(建保1)の和田合戦で和田方にくみして衰退した。下って室町時代に，関東管領上杉氏の影響下にあった武州南一揆の主導的有力国人として現れる平山三河入道は，おそらく季重一族の末流であろう。

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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