The family name Ogasawara is believed to have been given by Emperor Takakura, and starting with Yoritomo MINAMOTO, the clan served for generations as instructors of Kyuho to military commanders.
小笠原姓は長清が高倉天皇から賜ったとされ、源頼朝をはじめとする武将の糾法（弓馬術礼法）師範を代々つとめていた。