Life and episcopate
According to his life, Leo was born at Ravenna of pious and noble parents and was educated there before being ordained to the priesthood. He was distinguished by benevolence and Christian love for the poor and for wanderers. One account relates that in his youth he became a monk and afterward moved to Reggio Calabria, where the bishop appointed him archdeacon.
He was elected bishop of Catania, by one reckoning in 765 and as the fifteenth bishop of that see. Throughout his episcopate he remained renowned for his care of those in need. Tradition further holds that during the period of Byzantine iconoclasm he opposed the destruction of holy images and for a time endured exile in the mountainous country of Sicily before returning to his bishopric.