There is an opinion that he was a Christian daimyo, and it is also said that he was christened (with a Christian name Augustin) (A Buddhist image normally withheld from public view of Hongyo-ji Temple).
キリシタン大名という説があり、洗礼（名：オーギュスチン）を受けたとも言われている（本行寺秘仏）。