Irenaeus

Irenaeus (AD 130–202) was the bishop of Lugdunum in Gaul (modern Lyons, France), a stalwart opponent of heresy, and an influential witness concerning the development of the biblical canon.
Little is known about the life of Irenaeus. We know that he was from Smyrna in Asia Minor and a student there of Polycarp (who was a disciple of the apostle John). Irenaeus moved to Rome and studied under Justin Martyr.