The historical figure of Constantine became a hagiographic myth by Christian apologists (Lactantius, Eusebius of Caesarea, and others) and in the emperor's life and especially after his death. But the myth experienced different journeys in both Parties Imperii: in the West, with the disappearance of Arianism and aspirations to the primacy of the bishops of Rome, he proceeded to rework important aspects of the life of the emperor to support the aspirations of the emerging papacy. It was thus emerged first in the V century, the legend of the Actus Silvestri he attributed to the bishop of Rome Sylvester (314-335) a prominence it never had: the conversion and baptism of Constantine and the attribution to the Bishop of Rome primacy over other bi...