Development of the New Testament canon a novelty in Irenaeus's time. "Against Heresies" 3.11.7 acknowledges that many heterodox Christians use only one gospel while 3.11.9 acknowledges that some use more than four. The success of Tatian's Diatessaron in about the same time period is "...a powerful indication that the fourfold Gospel contemporaneously sponsored by Irenaeus was not broadly, let alone universally, recognized." Irenaeus apparently quotes from 21 of the New Testament books and names the author he thought wrote the text. He mentions the four gospels, Acts, the Pauline epistles with the exception of Hebrews and Philemon, as well as the first epistle of Peter, and
Development of the New Testament canon Development of the New Testament canon The canon of the New Testament is the set of books Christians regard as divinely inspired and constituting the New Testament of the Christian Bible. For most, it is an agreed-upon list of twenty-seven books that includes the Canonical Gospels, Acts, letters of the Apostles, and Revelation. The books of the canon of the New Testament were written before 120 AD. For the Orthodox, the recognition of these writings as authoritative was formalized in the Second Council of Trullan of 692. The Catholic Church made dogmatic definition upon its Biblical canon in 382 at