Gonso worked as betto (chief administrator) of Gufuku-ji Temple (also known as Kawara-ji Temple) and Sai-ji Temple, which was under construction at that time, and became Daisozu (the upper Buddhist priests in the second highest position) in 826.
弘福寺（川原寺）別当や当時造営中であった西寺の別当を歴任して826年（天長3年）大僧都に至った。