After its foundation by Fujiwara no Kiyohira in 1087, the Northern Fujiwara clan ruled the
Mutsu and
Dewa Province for over a century. Along with Kiyohira, the next two generations of
Fujiwara no Motohira and
Hidehira saw the zenith of Northern Fujiwara's power in the Tōhoku region. Hidehira had remained neutral during the Genpei War, but when Yoshitsune took refuge in Hiraizumi, he decided to protect him. Thus, the Battle of Ōshū began. Yasuhira's forces were defeated one after another, and on October 2, he fled Hiraizumi leaving it afire. Yoritomo entered Hiraizumi the next day. Yasuhira was found and killed in Nienosaku, Hinai, Mutsu Province (present-day
Ōdate,
Akita Prefecture) on October 14. The Battle of Ōshū resulted in the destruction of the Northern Fujiwara clan. This marked the end of the tumultuous period of civil war that began in 1180, and the completion of Yoritomo's nationwide domination and the establishment of the
Kamakura shogunate. == Notable members ==