Iranaeus 'Against Heresies'Irenaeus (early 2nd centuryc. AD 202, also referred to as Saint Irenaeus, was Bishop of Lugdunum in Gaul, then a part of the Roman Empire (now Lyon, 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 traditionally a disciple of John the Evangelist. Irenaeus' best known book, Adversus Haereses or Against Heresies (c. 180), is