Kazuo YAMADA who was a chief priest of Teisho-in Temple, which is Tadateru's ancestral temple, has the idea of Tadateru being pardoned for the anniversary of 300 years after his death, and petitioned Tsunenari TOKUGAWA, who is the 18th head of the Tokugawa family, to have it fulfilled.
忠輝の菩提寺である貞松院の住職・山田和雄が300回忌での赦免を思い立ち、徳川宗家十八代目当主の徳川恒孝に願い出て実現した。