You're the last person I'd expect to post this, nmh! I about fell off my chair. :-)
But, I'm curious. What passage are you referring to? 1 Pt 5:13 greets the recipients in the name of "she who is at Babylon," the "she" probably being the church at "Babylon". Some people argue that this "Babylon" is the real Babylon, in Mesopotamia, but the historic Babylon had been abandoned about 2 centuries before. Besides, the Christians of Iraq have no corporate memory of St. Peter preaching to them; they consider their churches to have been founded by St. Thomas. So "Babylon" is probably a code word for somewhere else, perhaps Rome.
I'm unaware of any other Scripture passage placing St. Peter at Rome.