In 1627, at the age of 15, he studied at Seitoku Shoin, a hanko (domain school) in Sakura Domain (the predecessor of the present Chiba Prefectural Sakura Senior High School).
寛永4年、15歳で佐倉藩・藩校、成徳書院（現在の千葉県立佐倉高等学校の前身）で学ぶ。