. . . . "0130Z"^^ . . . "Irenaeus"@en . . . . . "Bishop and Martyr"@en . . . . . . . . . "56604300" . "0202Z"^^ . . "Irenaeus (/a\u026Ar\u0259\u02C8ni\u02D0\u0259s/; Greek: \u0395\u1F30\u03C1\u03B7\u03BD\u03B1\u1FD6\u03BF\u03C2) (early 2nd century \u2013 c. 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."@en . "Saint Irenaeus"@en . "Bishop and saint" .