Peter, Paul & Rome

In 2nd Timothy, considered by most to be the last epistle that Paul wrote which made it into the Bible, he asks Timothy to bring Mark with him to Rome. First, this is interesting because Paul and Barnabas had a big disagreement about Mark earlier in Acts, and they split up and went their separate ways because of it. Apparently Paul and Mark were reconciled at some point or another, although the text never mentions anything about Barnabas after that.
Paul was a Roman citizen, so if he were being executed in Rome he would be given time to put his things in order first. Mark could have come to Rome to act as Paul's secretary. This is interesting because Mark later acts as Peter's secretary in Rome, acting as his scribe for the documents written "from Babylon." We also assume that the Gospel of Mark is in fact Peter's memoirs as recorded by Mark, so perhaps it was because of Paul's request that Mark was in Rome and eventually recorded the Gospel of Mark!