New Testament Testament appear differs between some collections and ecclesiastical traditions. In the Latin West, prior to the Vulgate (an early 5th-century Latin version of the Bible), the four Gospels were arranged in the following order: Matthew, John, Luke, and Mark. The Syriac Peshitta places the major Catholic epistles (James, 1 Peter, and 1 John) immediately after Acts and before the Pauline epistles. The order of an early edition of the letters of Paul is based on the size of the letters: longest to shortest, though keeping 1 and 2 Corinthians and 1 and 2 Thessalonians together. The Pastoral epistles were apparently
Development of the New Testament canon present in none of these texts. The narrative mainly follows the chronology of John. This is called the Diatessaron ("(Harmony) Through Four") and it became the official Gospel text of the Syraic church, centered in Edessa. Irenaeus of Lyons referred directly to a defined set of four gospels (the "Tetramorph"), "c". 180. In his central work, "Adversus Haereses" Irenaeus denounced various early Christian groups that used only one gospel, such as Marcionism which used only Marcion's version of Luke, or the Ebionites which seem to have used an Aramaic version of Matthew, as well as groups that used more than