 Additionally, the story of Bishop Marcian depends on a hagiographical source of the 10th century, which is full of anachronisms.Fedele Savio points out that the earliest document referring to Marcian was written between 729 and 820, and that it neither calls Marcian a bishop nor the Bishop of Tortona; and, as he points out, the letter of Bishop Eusebius of Vercelli, written to the people of Tortona from his exile in Scythopolis in 356, makes no mention of a bishop.The Bishop of Tortona, Vincenzo Capelli, nonetheless organized an event in October 1875 to celebrate the 18the centenary of Martianus' episcopal consecration.