The Miura family (三浦氏 Miura-shi) was one of the branch families descended from the Minamoto clan. 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. Miura remains a common family name in Japan today. The Miura clan supported Minamoto no Yoritomo 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.