<p>5:13 <i>She that is in Babylon- </i>If a code name for Rome, then this would indicate Peter was present in Rome at some stage, and this would nicely explain his allusions to Paul's letter to the Romans. But &quot;Babylon&quot; is also a title for Jerusalem in the prophets and later in Revelation. He may be reminding these Jewish Christians, exiled from Jerusalem, that there were still faithful believers in Jerusalem.</p><p><i>Elect together with you</i>, greets you, and so does Marcus my son- The letter opens with the point that our election or calling operates through the Spirit, and Peter has urged his readers amongst the Jewish Christian exiles to perceive how the Spirit has continued the salvation process with them through their experiences. But it operates according to how it operated from the beginning, when we were first elected or chosen. But we are not the only ones chosen- Gentile believers in Rome, or perhaps other Jewish Christians back in Jerusalem from where they had fled, were also just as much part of the Spirit's ongoing plan and process of operation. This is the unity of the Spirit- the same Spirit operating in our lives is also operating in those of our brethren from whom we may be somewhat distanced, and whom we may be tempted to despise.</p><p>We note that Peter had a believing wife, and here we read that he had a believing son. He was therefore well qualified as an elder.</p>