Syrus of Pavia was a 4th-century bishop, originally from Palestine, who is traditionally recognized as the first bishop of Pavia. According to various historical traditions, he traveled from Rome to the Po Valley to spread the Christian faith across major cities in northern Italy. He is noted for his efforts to convert followers of Arianism within his diocese. Some accounts link him to the apostolic era, suggesting he was a disciple of Hermagoras, who was himself a student of Mark the Evangelist.