The were a samurai kin group which rose to prominence in the Sengoku period and the Edo periods. Under the Tokugawa shogunate, the Ōkubo, as hereditary vassals of the Tokugawa clan, were classified as one of the fudai daimyō clans. Ōkubo clan genealogy The Ōkubo clan traces its origins to 16th century Mikawa Province. The Ōkubo claimed descent from the Utsunomiya clan, descendants of Fujiwara no Michikane (955–995). Ōkubo Tadatoshi (1499–1581) and his younger brother Ōkubo Tadakazu (1511–1583) were the first to abandon the Utaunomiya name for "Ōkubo". Both brothers were among the seven closest retainers of Matsudaira Hirotada, the father of Tokugawa Ieyasu. Main branch Ōkubo Tadayo (1531–1593), the son of Ōkubo Tadakazu, participated as a general in all the military campaigns of Tokugawa Ieyasu. In 1590, upon the transfer of Ieyasu to the Kantō region, he was rewarded with formal recognition as a daimyō, and the clan was established in the han of Odawara (45,000 koku) in Sagami Province, where the Ōkubo were made castellans Odawara Castle. The main branch of Ōkubo clan consists of his family and their descendants. Ōkubo Tadachika (1553–1628) succeeded his father at Odawara, and the revenues of the han had increased to 70,000 koku. In 1614 Tadachika was accused of participation in the plot of Tokugawa Tadateru against his brother, Shōgun Tokugawa Hidetada; and the Ōkubo were dispossessed. Tadahicka was confined at Hikone in Ōmi Province. Ōkubo Tadamoto (1604–1670) was implicated initially in the disgrace of his grandfather; however, he was installed in 1632 at Kanō Domain (50,000 koku) in Mino Province, and then he was transferred in 1639 to Akashi Domain in Harima Province. He was transferred again in 1649 to Karatsu Domain (90,000 koku) in Hizen Province, and he was moved again in 1678 to Sakura Domain in Shimōsa Province. This senior branch of the Ōkubo was restored to Odawara Domain (100,000 koku), where they resided until the Meiji Restoration. The final daimyō of Odawara Domain, Ōkubo Tadayoshi died in the Satsuma Rebellion. The head of this clan, Ōkubo Tadanori line was ennobled as a viscount ("shishaku") in the kazoku peerage system. Cadet lines A cadet branch was created in 1601 for Ōkubo Tadasuke (1537–1613), the second son of Ōkubo Tadakazu, who had served as a general in the armies of Tokugawa Ieyasu. Ōkubo Tadasuke was given Numazu Castle and assigned Numazu Domain (20,000 koku) in Suruga Province; however, he died