 In the cathedral of Ravenna, Italy, behind the altar, there's a beautiful mosaic of that city's first bishop, the saint whom the church honors today, Saint Apollinaris. Tradition has it that he was a discipler for the apostle Peter, who ordained him and sent him to Ravenna, where he became famous for healing people in the name of Jesus. In fact, that's what got him into trouble and led to his martyrdom.