They held large fiefs, and retained great political influence.

They were one of the primary opponents of the Hōjō family of regents in the mid-13th century, and again at the beginning of the 16th.

The Miura clan supported Minamoto no Yoritomo[1] in the foundation of the Kamakura shogunate, but were later annihilated by Hōjō Tokiyori in 1247.

However, the family name was reassigned to a supporter of the Hōjō clan, and the Miura continued to rule Miura Peninsula through the Muromachi period until their defeat at Arai Castle in a 1516 attack by Hōjō Sōun.

'Miura' was also the family name given to English sailor William Adams, who became shipwrecked in Japan in the year 1600.