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Feast Day of June 28
bishop of Lugdunum in Gaul, 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 disciple of Polycarp of Smyrna, who was said to be a disciple of John the Evangelist. Irenaeus's best-known book, 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 Valentinus. As the first great Catholic theologian, he emphasized the traditional elements in the Church, especially the episcopate, Scripture, and tradition. Irenaeus wrote that the only way for Christians to retain unity was to humbly accept one doctrinal authority--episcopal councils. Against the Gnostics, who said that they possessed a secret oral tradition from Jesus himself, Irenaeus maintained that the bishops in different cities are known as far back as the Apostles — and none of them was a Gnostic — and that the bishops provided the only safe guide to the interpretation of Scripture. Irenaeus is the earliest witness to recognition of the canonical character of all four gospels.Irenaeus is recognized as a saint by both the Eastern Orthodox Church and the Roman Catholic Church. His feast day is 28 June.Born in the first half of the 2nd century (the exact date is disputed: between the years 115 and 125 according to some, or 130 and 142 according to others), Irenaeus is thought to have been a Greek from Polycarp's hometown of Smyrna in Asia Minor, now İzmir, Turkey. Unlike many of his contemporary Christians, he was raised in a Christian family rather than converting as an adult.