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
Rabbula Gospels of the Rabbula Gospels, notably those representing the Crucifixion, the Ascension and Pentecost, are real pictures with a decorative frame formed of zigzags, curves, rainbows and so forth. The scene of the Crucifixion is the earliest to survive in an illuminated manuscript, and shows the Eastern form of the image at the time. There is a miniature of the Apostles choosing a new twelfth member (after the loss of Judas); this is not an event found in the Canonical Gospels (though it is mentioned in Chapter 1 of Acts) and is almost never seen in later art. The artist was