The New Testament speaks repeatedly of Paul's presence in Rome, and Peter's is implied. There had always been, moreover, a persistent tradition, accepted throughout the Christian Church, that Peter was the first Bishop of Rome. While there is no complete documentary proof for this belief, it appears to have been generally accepted at least as early as the middle of the second century. There is, certainly, no conflicting tradition, no rival claimant. The _belief itself_, whether or not it corresponds with actual events, is indubitably a fact, and a fact of the greatest historical importance. Peter enjoyed a certain preëminence among the other apostles and was singled out by Christ upon several occasions. In a passage of the New Testament which has affected political history more profoundly than the edicts of the most powerful monarch, Christ says: "And I say also unto thee, That thou art Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it. And I will give unto thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven: and whatsoever thou shalt loose on earth shall be loosed in heaven."[27] [Sidenote: The Roman Church the mother church.] It was thus natural that the Roman Church should early have been looked upon as the mother church in the West. Its doctrines were considered the purest, since they had been handed down from its exalted founders. When there was a difference of opinion in regard to the truth of a particular teaching, it was natural that all should turn to the Bishop of Rome for his view. Moreover, the majesty of the capital of the world helped to exalt its bishop above his fellows. It was long, however, before all the other bishops, especially those in the large cities, were ready to accept unconditionally the authority of the Bishop of Rome, although they acknowledged his leading position and that of the Roman community. [Sidenote: Obscurity of early bishops of Rome.] We know comparatively little of the bishops of Rome during the first three centuries of the Church's existence. Even as the undisputed heads of their persecuted sect, they could not have begun to exercise the political influence which they later enjoyed, until Christianity had gained the ascendancy and the power of the Empire had become greatly weakened. [Sidenote: Period of the Church fathers.]