In contrast, according to the historical data reserved by Misawa family, who was retained by Chofu Domain, the founder of Misawa clan was Tamekuni IIJIMA whose main domain was Iijima, Ina county, Shinano Province and who was descded from MINAMOTO no Mitsuyoshi of the same Seiwa-Genji.
それに対して、長府藩に仕えた三沢家に伝わる史料では、同じ源氏でも、源満快の流れを汲んだ信濃国伊那郡飯島を本領とした飯島為国を祖としている。