ROMAN CLAIM
The principle underlying the Roman claim is contained in the idea of succession. "To succeed" is to be the successor of, especially to be the heir of, or to occupy an official position just after, as Victoria succeeded William IV. Now the Roman Pontiffs come immediately after, occupy the position, and perform the functions of St. Peter; they are, therefore, his successors.
We must prove that St. Peter came to Rome, and ended there his pontificate;
We must prove that the Bishops of Rome who came after him held his official position in the Church.
As soon as the problem of St. Peter's coming to Rome passed from theologians writing pro domo suâ into the hands of unprejudiced historians, i.e. within the last half century, it received a solution which no scholar now dares to contradict;
Well, that does it for me, this proves beyond a shadow of doubt that Peter was in Rome, and the RCC's simply succedded him, case close."It's in their book"