 It is easily visible from the SS6 road that runs from Canelli to Asti.San Marzano was named after St. Marcian of Tortona, the first Bishop of Tortona (or perhaps a bishop of Ravenna), who was martyred in 2nd century by the Roman emperor Hadrian.The suffix "Oliveto" was added in 1862 because olives were said to have prospered there in ancient times.