Jeanne-Nicole Mellon Saint-Laurent (ed.), "Onesimus" in last modified August 17, 2016, http://syriaca.org/person/3015 Onesimus http://syriaca.org/person/3015 Onesimus was an early Christian associate of the apostle Paul in Rome. Onesimus had at one point been a slave of Philemon, a point which Paul discussed in his Epistle to Philemon. According to tradition, he later became a bishop and was martyred. Martyr Enslaved person Bishop Saint Onesimus, St The Oxford Dictionary of the Christian Church