Marcian (Marciano, Marziano, Marcianus) of Tortona (died 117 or 120 AD) is a saint of Roman Catholic church. He is traditionally said to have been the first bishop of Tortona, in what is now north-western Italy, a post he held for forty-five years. Tradition states that he was born to a pagan family but was converted by Barnabas and then confirmed in the Christian faith by Sirus (Siro), bishop...