d.400. Bishop of Milan. He was first heard of in Rome (c.350-60), where he was instrumental in the conversion of Victorinus, a Platonist professor of rhetoric. When his pupil Ambrose became bishop of Milan (373), he removed there to prepare him for baptism and ordination. He helped the seeking Augustine by recounting the story of Victorinus's conversion and encouraging him in his reading of the Platonists; some of Augustine's early treatises were addressed to him. He succeeded Ambrose as bishop in 397.