The traditional Western commemoration of Onesimus is on 16 February.[13] But in the 2004 edition of the Roman Martyrology, Onesimus is listed under 15 February. There, he is described as "[a] runaway slave, whom the apostle Paul received to the faith of Christ while in prison, regarding him as a son of whom he had become father, as he himself wrote to Philemon, Onesimus's master".[14]