Greek Philēmōn, possibly "one who kisses affectionately" (from phileō). Wealthy Christian slaveholder in Colossae, probably converted under Paul's ministry in Ephesus (Philemon 19). He hosted a church in his home (v. 2). The epistle that bears his name — a 25-verse private letter — is one of the most remarkable documents in world literature on reconciliation: Paul, in prison, writes to Philemon pleading for Onesimus, Philemon's runaway slave who had found Paul, been converted, and was now being sent back as "no longer a slave but more than a slave, a beloved brother" (v. 16).
The letter to Philemon is the gospel applied to a concrete social problem. Paul does not issue an abolitionist manifesto; he does something arguably more powerful: he undermines the institution of slavery at its root by insisting that Philemon receive Onesimus as a brother. Once you confess that your runaway slave is your brother in Christ, bought with the same blood, heir of the same inheritance, equal before the same Lord — the logic of slaveholding collapses from within. The letter is also a masterclass in Christian persuasion. Paul: (1) affirms Philemon's character before making the request (vv. 4-7); (2) uses his apostolic authority as background but refuses to command (vv. 8-9); (3) makes the appeal tenderly — "I appeal to you for my child, Onesimus" (v. 10); (4) offers to pay any debt Onesimus owed (v. 18) — a small financial echo of the cross; (5) expresses confident expectation ("knowing that you will do even more than I say," v. 21). The letter ends with greetings from named fellow workers — no polemics, no doctrinal fireworks, just the gospel quietly rewriting power relations one relationship at a time.