 The Bishop of Tortona, Vincenzo Capelli, nonetheless organized an event in October 1875 to celebrate the 18the centenary of Martianus' episcopal consecration.In the first half of the fourth century, Tortona was a suffragan of the diocese of Milan.The first bishop, according to Fedele Savio, was St. Innocentius, who in his opinion was the immediate predecessor of St. Exuperantius (381), the first of whom we have certain historical record, and who was highly praised in a sermon of Maximus of Turin (or of Ambrose of Milan).