Irenaeus  

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Saint Irenaeus (Greek: Εἰρηναῖος), (2nd century AD – c. 202) was Bishop of Lugdunum in Gaul, then a part of the Roman Empire (now Lyons, France). He was an early church father and apologist, and his writings were formative in the early development of Christian theology. He was a hearer of Polycarp, who in turn was a disciple of John the Evangelist.

Irenaeus' best-known book, Adversus Haereses or Against Heresies (c. 180) is a detailed attack on Gnosticism, which was then a serious threat to the Church, and especially on the system of the Gnostic Valentinus.

See also

• POxy 405 — 3rd century papyrus portion of Against Heresies