Peter emerges in the Gospels as spokesman of the Twelve: he walks on water, confesses Christ at Caesarea Philippi, and denies him before the Passion. After the Resurrection he is restored (“Feed my sheep”) and leads the Jerusalem community at Pentecost. Paul’s letters acknowledge his authority; Acts places him at the Cornelius episode and the Council of Jerusalem. Early Christian writers (Clement of Rome, Irenaeus) link his ministry and martyrdom to Rome under Nero, a tradition that shaped the Latin Church and the geography of the Vatican basilica.
His office is pastoral and foundational: the “rock” upon which the Church is built in Matthew’s Petrine text, and the keeper of the keys that symbolize binding and loosing. In art this office reads as papal—tiara, throne, or delivery of keys—even when the scene is Gospel-narrative rather than dogmatic.