New Testament that Luke the Evangelist, an associate of St. Paul who was probably not an eyewitness to Jesus' ministry, wrote the Gospel of Luke and Acts of the Apostles. Scholars are also divided on the traditional claim that Mark the Evangelist, an associate of St. Peter who may have been an eyewitness to Jesus' ministry, wrote the Gospel of Mark. Scholars are more divided over the traditional claim that Matthew the Apostle wrote the Gospel of Matthew and that John the Apostle wrote the Gospel of John. Opinion, however, is widely divided on this issue and there is no widespread consensus.
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