However, due to the Tokugawa shogunate's religious interference, the Nehanshu was oppressed, and Monjuin Kuzen (Buddhist name of Masatomo after entering the priesthood) was exiled to Sakura City in Chiba Prefecture.
ところが徳川幕府の宗門干渉によって、涅槃宗は弾圧を受け、この法難のため文殊院空禅（政友の法名）は、千葉の佐倉市へ流された。