The Acts of Sylvester (Latin: Actus Silvestri) are a series of legendary tales about the fourth-century bishop of Rome, Sylvester I. Sylvester was the bishop of Rome at the critical point in European history when Constantine the Great became the first Christian emperor. Yet, despite the claims that arose in later centuries of Roman primacy, Sylvester played no significant role in the Christianizing of the Roman Empire during this crucial period. These later legends arose in order to augment the reputation of Sylvester and to correct a number of embarrassing events for the Church, such as his conspicuous absence at both the Synod of Arles in 314 and the First Council of Nicaea in 325, and that Constantine had been baptized by an Arian bishop.