Try the Gospel of Mark !!!!
I’m interested in just what part of “the Gospel of Mark” you’re referring to, johnd201. Where does the Gospel of Mark say that Peter went to ROme?
When Paul wrote to the Romans around 58ad and greets many and mentions many people but never mentions Peter even being in Rome. Paul wrote from Rome and to Rome and never even mentions Peter who the Catholics say started the church there.
Now show me the passage that you believe proves that Peter was in Rome at all let alone enough time to start a church there.