Saint Marcian of Syracuse was a first-century bishop and martyr who is traditionally identified as a disciple of the apostle Peter. Born in Antioch, he is said to have traveled to Sicily, where he served as the first bishop of Syracuse. While hagiographic traditions from the Byzantine era describe him as a foundational figure of the Western church, modern scholars debate his exact historical timeline due to the late date of surviving written accounts. He is venerated as a saint in both the Catholic and Orthodox traditions.