sentences:  From Vercelli the Gospel spread through the valley of the Po and its environs; towards the end of the fourth century, perhaps even during the episcopate of Saint Eusebius, new dioceses were erected.From Eusebius to Nottingo (830) there were forty bishops, whose images were preserved in the Eusebian basilica, predecessor of the present cathedral, so called because Saint Eusebius, who dedicated it to the martyr Saint Theonestus, was interred in it.He introduced the common and monastic life among his clergy, from whom bishops for the surrounding territory were often selected.