Soon after the fall of 'the Oda Ise no kami family' (the Iwakura Oda clan) losing support from the Saito clan, the name of Toshinobu was mentioned as the lord of Iwakura-jo Castle in literatures such as "Bukoyawa."
斎藤氏の後ろ盾を失った「織田伊勢守家」（岩倉織田氏）の衰退後、まもなく岩倉城主として敏信の名が『武功夜話』などの文献に登場する。