Engaged in administration concerning Buddhist temple and Shinto shrine affairs together with Genkitsu KANSHITSU and Katsushige ITAKURA, he was involved in projects, including the prohibition of the Christian religion, as well as the establishment of Jiin shohatto (the Acts for the Buddhist Temples), Buke shohatto (the Acts for the Military Houses) where the basic policies of the bakufu were laid out, and Kinchu narabini kuge shohatto (a set of regulations that applied to the emperor and the Kyoto nobles).
閑室元佶や板倉勝重とともに寺社行政に携わり、キリスト教の禁止や、寺院諸法度、幕府の基本方針を示した武家諸法度、朝廷権威に制限を加える禁中並公家諸法度の制定などに関係する。