A prisoner of Christ Jesus. He writes a private letter, as friend to friend, and therefore does not describe himself by his official title of apostle. Having to plead the cause of a slave, he begins by putting himself into a similar position as the "bondman of Jesus Christ"—"to obtain thereby the more ready compliance" (Chrysostom).
By such a reverend bondage he beseeches Philemon, "and the bondage of Paul was liberty to Onesimus" (Scipio Gentilis). Timothy, etc. He was, then, with St. Paul at the time of writing; therefore at Rome; and this fixes the date of composition at all events before that of the Second Epistle to Timothy, when the apostle was again at Rome (2 Timothy 1:17; 2 Timothy 4:6, 2 Timothy 4:16).
Fellow-worker with St. Paul in promoting the spread of the gospel, either by his wealth and influence, less probably by preaching. The time when would be that of St. Paul's long stay at Ephesus and its neighborhood (Acts 19:8-22).