Ogasawara clan founded by Ogasawara Nagakiyo
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, Ogasawara 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: