Peter the First Pope

Matthew 16:18-19: "And I tell you, you are Peter, and on this rock I will build my church, and the powers of death (gates of hell) shall not prevail against it. I will give you (Peter) the keys of the kingdom of heaven, and whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven. 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, etc."

Later Our Lord made Simon-Peter pastor of both the lambs and the sheep, that is His whole flock.

John 21: 15-17: When they had finished breakfast, Jesus said to Simon Peter, "Simon, son of John, do you love me more than these?" He said to him, "Yes, Lord; you know that I love you." He said to him, "Feed my lambs." A second time he said to him, "Simon, son of John, do you love me?" He said to him, "Yes, Lord; you know that I love you." He said to him, "Tend my sheep." He said to him the third time, "Simon, son of John, do you love me?" Peter was grieved because he said to him the third time, "Do you love me?" And he said to him, "Lord, you know everything; you know that I love you." Jesus said to him, "Feed my sheep."

Our Lord promised that Peter would confirm the faith of the other Apostles:

Luke 22:32: " . . . but I have prayed for you [Peter] that your faith may not fail; and when you have turned again, strengthen your brethren."

Changing Simon's name to Peter, our Lord established his Church with Peter at its head. Any Church separated from the See of Peter is not the true Church of Christ.