Irenaeus, Saint

born с 120/140, Asia Minor
died с 200/203, probably Lyon; Western feast day June 28; Eastern feast day August 23

Bishop and theologian.

Born of Greek parents, he was a missionary to Gaul before being named bishop of Lugdunum (modern Lyon, France). All his major works, including Against Heresies, were written in opposition to Gnosticism. To counteract Gnostic influence, he promoted the development of an authoritative canon of the New Testament. His defense of the belief that the Christian God and the God of the Old Testament were identical led to the development of the Apostles' Creed. His writings against the Gnostics also supported the authority of the bishops, and he claimed that the bishops of various cities were known as far back as the Apostles (see apostolic succession). His works have proved a valuable source of information on the Gnostics, because he gave accurate summaries of their beliefs before refuting them.

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▪ bishop of Lyon
Introduction
born c. 120, /140, Asia Minor
died c. 200, /203, probably Lyon; Western feast day June 28; Eastern feast day August 23

      bishop of Lugdunum (Lyon) and leading Christian theologian of the 2nd century. His work Adversus haereses (Against Heresies), written in about 180, was a refutation of Gnosticism. In the course of his writings Irenaeus advanced the development of an authoritative canon of Scriptures, the creed, and the authority of the episcopal office.

Early career.
      Though his exact birth date is unknown, Irenaeus was born of Greek parents in Asia Minor. His own works establish a few biographical points, such as that as a child he heard and saw Polycarp (Polycarp, Saint), the last known living connection with the Apostles, in Smyrna, before that aged Christian was martyred in 155. Eusebius of Caesarea also notes that after persecutions in Gaul in 177 Irenaeus succeeded the martyred Pothinus as bishop of Lugdunum. According to Eusebius, who wrote a history of the church in the 4th century, Irenaeus, prior to his becoming bishop, had served as a missionary to southern Gaul and as a peacemaker among the churches of Asia Minor that had been disturbed by heresy.

      The known biographical data—if taken together with his published works—are sufficient to give a picture of an unusual life. Historical sources testify to a close cultural connection between Asia Minor and southern France (the Rhône Valley) during the 2nd century. According to tradition, the Apostle John, as a very old man who had “seen the Lord” (i.e., Jesus), lived at Ephesus in the days when Polycarp was young. Thus, there were three generations between Jesus of Nazareth and Irenaeus of southern France.

      The era in which Irenaeus lived was a time of expansion and inner tensions in the church. In many cases Irenaeus acted as mediator between various contending factions. The churches of Asia Minor continued to celebrate Easter on the same date (the 14th of Nisan) as the Jews celebrated Passover, whereas the Roman Church maintained that Easter should always be celebrated on a Sunday (the day of the Resurrection of Christ). Mediating between the parties, Irenaeus stated that differences in external factors, such as dates of festivals, need not be so serious as to destroy church unity.

Irenaeus' writings: conflict with the Gnostics.
      Irenaeus adopted a totally negative and unresponsive attitude, however, toward Marcion, a schismatic leader in Rome, and toward Gnosticism, a fashionable intellectual movement in the rapidly expanding church that espoused dualism. Because Gnosticism was overcome through the efforts of the early Church Fathers, among them Clement of Alexandria (Clement of Alexandria, Saint) and Irenaeus, Gnostic writings were largely obliterated. In reconstructing Gnostic doctrines, therefore, modern scholars relied to a great extent on the writings of Irenaeus, who summarized the Gnostic views before attacking them. After the discovery of the Gnostic library near Najʿ Ḥammādī (in Egypt) in the 1940s, respect for Irenaeus increased: he was proved to have been extremely precise in his report of the doctrines he rejected.

      All his known writings are devoted to the conflict with the Gnostics. His principal work consists of five books in a work entitled Adversus haereses. Originally written in Greek about 180, Against Heresies is now known in its entirety only in a Latin translation, the date of which is disputed (200 or 400?). A shorter work by Irenaeus, Demonstration of the Apostolic Preaching, also written in Greek, is extant only in an Armenian translation probably intended for the instruction of young candidates for Baptism.

      Irenaeus asserted in a positive manner the validity of the Jewish Bible (the Old Testament), which the Gnostics denied, claiming that it upheld the laws of the Creator God of wrath. Though Irenaeus did not actually refer to two testaments, one old and one new, he prepared the way for this terminology. He asserted the validity of the two testaments at a time when concern for the unity and the difference between the two parts of the Bible was developing. Many works claiming scriptural authority, which included a large number by Gnostics, flourished in the 2nd century; by his attacks on the Gnostics, Irenaeus helped to diminish the importance of such works and to establish a canon of Scriptures.

      The development of the creed and the office of bishop also can be traced to his conflicts with the Gnostics. On the basis of the New Testament alone, which is concerned with the salvation of man, the creed would not be expected to begin with an article about the creation of the world and man. But, because the Gnostics denied that the God revealed in the New Testament was the Creator, the first article of the creed was for polemical reasons directly connected with Genesis (“In the beginning God created the heavens and the earth”). Irenaeus refers to the creed as a “Rule of Truth” used to combat heresy.

      The oldest lists of bishops also were countermeasures against the Gnostics, who said that they possessed a secret oral tradition from Jesus himself. Against such statements Irenaeus maintains 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. With these lists of bishops the later doctrine of “the apostolic succession” of the bishops could be linked. Even the unique position of authority of the bishop of Rome is emphasized by Irenaeus, though in an obscure passage.

      Though there is no evidence, other than legendary, about his death, the last decade of the 2nd century is generally assumed to be the period in which Irenaeus died.

Gustaf Wingren

Additional Reading
English translations: Against the Heresies, trans. by D. Unger, rev. by John J. Dillon (1992); Proof of the Apostolic Preaching, trans. by J. Smith (1952). Studies: Mary Ann Donovan, One Right Reading?: A Guide to Irenaeus (1997).

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Universalium. 2010.

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