Epaphras (Επαφρας). The Colossian preacher who apparently started the work in Colossae, Hierapolis, and Laodicea, and who had come to Rome to enlist Paul's help in the fight against incipient Gnosticism in the Lycus Valley.

My fellow-prisoner (ο συναιχμαλωτος μου). See on Romans 16,7Kolosser 4,102 Corinthians 10:5