The Catholic hierarchy states Matt 16 as their foundation to the papacy to todays Pope. But scriptures states " that all things are to be confirmed by two or three witnesses." I find however that more witnesses speak against such falicy and find it hard to imagine, that a whole hierarchy, for hundreds of years have leaned on this foundation as the truth.  Mark and Luke were both at this meeting with Jesus and Cephas/Peter, and they don't relate that Cephas/Peter was made head of the Church by Jesus.  Cephas/Peters own letters don't mention this either.  Pauls epistles don't even hint at this being so. And to say Cephas/Peter was in Rome, Acts 18: 1 After these things he departed from Athens, and came to Corinth. 2 And he found a certain Jew named Aquila, a man of Pontus by race, lately come from Italy, with his wife Priscilla, because Claudius had commanded all the Jews to depart from Rome: and he came unto them; Seven years after Pauls conversion he was led to go to Jerusalem to meet with the apostles, and Peter was there. Fourteen years later Pauls again went up to Jerusalem to meet up with the apostles, and Peter was there also. So as I see it, Matt 16 Jesus was speaking of the " revelation from God " as to the rock by which He will build the Church, not Cephas/Peter.... And since the Lord isn't partial to any, as to one above another.