According to Galatians 2:1-10, the Apostle Paul returned to Jerusalem after 14 years of ministry to visit the so-called Jerusalem “Pillars” Cephas (i.e. Peter), John, and James. The reason for the visit was that his “gospel” to the “Gentiles” or the non-Jewish peoples of the world had become a source on controversy and he felt impelled to present it to the leaders of repute in Jerusalem. From Paul’s perspective, they worked out a division of labour where the Pillars would preach to the “circumcised” and Paul to the “uncircumcised”, euphemisms for Jews and Gentiles respectively. The question is whether this means that their respective mission fields extended to the Jews and non-Jews throughout the Roman Empire or that the Pillars would largely be restricted to Judea and the surrounding regions while Paul would spread the good news to the rest of the nations. If the latter meaning is correct, it may be hard to reconcile this with Peter going on a missionary journey to Rome. Of course, circumstances may have changed and Peter could have felt compelled to undertake a mission to Rome later in his life.