St. Onesimus, as mentioned in St. Paul’s Letter to Philemon, was a slave of Philemon in Phrygia circa the year 90. St. Onesimus ran away and was eventually befriended by St. Paul, who converted St. Onesimus. St. Paul sent him back to Philemon with an epistle asking Philemon to free St. Onesimus, who eventually died a martyr.