Ogasawara clan The was a Japanese samurai clan descended from the Seiwa Genji . The Ogasawara acted as " shugo " ( governors ) of Shinano province in the medieval period ( c . 1185 – 1600 ) , and as " daimyō " ( feudal lords ) of territories on Kyūshū during the Edo period ( 1600 – 1867 ) . During the Kamakura and Muromachi periods , the clan controlled Shinano province , while related clans controlled the provinces of Awa , Bizen , Bitchū , Iwami , Mikawa , Tōtōmi and Mutsu . According to some theories , the Miyoshi clan was descended from the Ogasawara clan . The clan developed a number of schools of martial arts during this period , known as Ogasawara - ryū , and contributed to the codification of bushido etiquette . Towards the end of the Sengoku period ( late 16th century ) , the clan opposed both Toyotomi Hideyoshi and Tokugawa Ieyasu . During the Edo period , the Ogasawara were identified as one of the " fudai " or insider " daimyō " clans which were hereditary vassels or allies of the Tokugawa , in contrast with the " tozama " or outsider clans . Ogasawara clan branches . The " fudai " Ogasawara clan originated in 12th century Shinano province . They claim descent from Takeda Yoshikiyo and the Seiwa - Genji . Broadly , there are two genealogical lines of the Ogasawara , the Matsuo and the Fukashi , each of which identify places in Shinano . The Matsuo line gave rise to the Ogasawara of Echizen , and the Fukashi line is ultimately established at the Ogasawara of Bunzen . The great grandson of Yoshikiyo , Nagakiyo , was the first to take the name Ogasawara . The area controlled by his descendants grew to encompass the entire province of Shinano . Nagakiyo ' s grandson , Ogawawara Hidemasa ( 1569 – 1615 ) , served Ieyasu ; and in 1590 , Hidemasa received Koga Domain ( 20 , 000 " koku " ) in Shimōsa province . In 1601 , Ieyasu transferred Hidemasa to Iida Domain ( 50 , 000 " koku " ) in Shinano ; then , in 1613 , he was able to return to the home of his forebears , Fukashi Castle ( 80 , 000 " koku " ) , now known as Matsumoto Castle . The branches of the " fudai " Ogasawara clan include the following : Ogasawara - Miyoshi line . The Miyoshi clan of " daimyō " were cadet descendants of the Ogasawara ; and through them , they were also descendants of the Seiwa - Genji Minamoto . At the beginning of the 14th century , Ogasawara Nagafusa established himself in Shikoku . Amongst his descendants in the 8th generation was Yoshinaga , who established himself at Miyoshi in Awa province ( now Tokushima Prefecture ) . Osagawa Yoshinaga took the name Miyoshi Yoshinaga and became a vassel of the Hosokawa clan , who were then the strongest force on the island . Accounts from the late 16th century include mention of Miyoshi Yoshitsugu as the nephew and adopted son of Emperor Chōkei ; however , his family in Shikoku disappears from history during this troubled period . Any remnants of the Miyoshi branch of the Ogasawara clan would have been vanquished by the Chōsokabe clan as they gradually took control of the entire island of Shikoku . Ogasawara Islands ( Bonin Islands ) . The Ogasawara clan is inlinked to Japanese discovery of the Bonin Islands , and to Japan ' s claim over those islands which are now administratively considered part of metropolitan Tokyo :