In late 1565, Mototada resigned Tayu at the age of 57 and shaved his head to become a priest and called himself Ichianzai Sosetsu (hereafter called Sosetsu).
永禄8年（1565年）の暮、57歳の元忠は大夫の座を退き、落飾して一安斎宗節を称した（以下、宗節と記す）。