gal2 7But contrariwise, when they saw that the gospel of the uncircumcision was committed unto me, as the gospel of the circumcision was unto Peter; 8(For he that wrought effectually in Peter to the apostleship of the circumcision, the same was mighty in me toward the Gentiles:) 9And when James, Cephas, and John, who seemed to be pillars, perceived the grace that was given unto me, they gave to me and Barnabas the right hands of fellowship; that we should go unto the heathen, and they unto the circumcision. 10Only they would that we should remember the poor; the same which I also was forward to do.
11But when Peter was come to Antioch, I withstood him to the face, because he was to be blamed. 12For before that certain came from James, he did eat with the Gentiles: but when they were come, he withdrew and separated himself, fearing them which were of the circumcision. 13And the other Jews dissembled likewise with him; insomuch that Barnabas also was carried away with their dissimulation. 14But when I saw that they walked not uprightly according to the truth of the gospel, I said unto Peter before them all, If thou, being a Jew, livest after the manner of Gentiles, and not as do the Jews, why compellest thou the Gentiles to live as do the Jews?
Peter was apostle to the jews, not the gentiles.. not the Romans in other-words
Peter is almost without exception named first whenever he appears with anyone else. In one (only?) example to the contrary, Galatians 2:9, where he (”Cephas”) is listed after James and before John, he is clearly preeminent in the entire context (e.g., 1:18-19; 2:7-8). Peter wrote his first epistle from Rome, according to most scholars, as its bishop, and as the universal bishop (or, pope) of the early Church. “Babylon” (1 Pet 5:13) is regarded as code for Rome.http://socrates58.blogspot.com/2006/03/50-new-testament-proofs-for-petrine.html