According to "Mino no Kuni Shokyuki," his ancestors worked as Hokumen no bushi (royal guards) for generations; his father was called MATSUNAMI Sakon Shogen Motomune, living in Nishino oka as a Ronin (samurai with no lord) for [unrevealed] reasons.
『美濃国諸旧記』によると先祖代々北面の武士をつとめ、父は松波左近将監基宗といい、事情によって牢人となり西岡に住んでいたという。