Onesimus

Onesimus (Ancient Greek: Ὀνήσιμος, romanized: Onēsimos, meaning "useful") was a Christian mentioned in the New Testament. He was a slave to Philemon, a Christian, and is the subject of Paul's Epistle to Philemon.

He may also be the same Onesimus mentioned by Ignatius of Antioch (died c. 107) as bishop in Ephesus. Eastern Orthodox tradition also list an Onesimus as the third bishop of Byzantium.

Source: Wikipedia — https://en.wikipedia.org/wiki/Onesimus