"Frois's History of Japan" states that after his mother's death, Joan NAITO did not care at all about his position as the lord of the castle, and drifted throughout the country, becoming increasingly involved in his faith.
『フロイス日本史』によると、母が亡くなってからの内藤ジョアンは城主の事など一向に気にかけなくなり、戦国の世を渡り歩き、ますます信仰の道に深く入っていた、と記載されている。