Tadateru showed an interest in commerce with other countries and was a man of culture who became acquainted with Japanese tea ceremony, paintings and pharmaceutical sciences as well as martial arts, and also he apparently believed in Christianity and was christened.
忠輝は海外との交易に興味を示し、武術を好むと同時に茶道、絵画、薬学に通じた文化人で、キリスト教の洗礼を受けキリスト教を信仰していたともされている。