The Miura of Sagami Province were descended from Miura Yoshiaki (d.1181), who was himself descended from Miura Takemichi (who claimed Taira ancestry). The Miura, while vice-governors of Sagami Province for the Taira, supported Minamoto Yoritomo in the 1180-85 Gempei War and afterwards enjoyed considerable influence. Perhaps for fear of their strong position, the Hôjô regent Tokiyori but his line was almost wiped out when his son Yasumura was killed following a rivalry with the Adachi family. A minor branch existed into the early Sengoku Period, only to fall to the Hôjô in 1516.
References
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005