Misawa clan, a kokujin ryoshu (local samurai lords) of Izumo Province, was reportedly oriignated from the Kiso line descended from Yoshinaka KISO of Seiwa-Genji (Minamoto Clan), or the Iijima line descded from MINAMOTO no Mitsuyoshi who was also from Seiwa-Genji.
出雲国の国人領主であった三沢氏の出自は、清和源氏木曾義仲を祖とする木曽系、同じく清和源氏満快流の飯島系と言われている。