New Testament the Anchor Bible Dictionary), may be the earliest known New Testament canon attributed to mainstream Christianity. It is similar, but not identical, to the modern New Testament canon. The oldest clear endorsement of Matthew, Mark, Luke, and John being the only legitimate gospels was written "circa" 180 AD. A four gospel canon (the "Tetramorph") was asserted by Irenaeus, who refers to it directly in his polemic "Against the Heresies", "It is not possible that the gospels can be either more or fewer in number than they are. For, since there are four zones of the world in which we live,
New Testament including works composed well into Late Antiquity, are relegated to the so-called New Testament apocrypha. Although not considered to be inspired by God, these "apocryphal" works may be helpful in the study of the New Testament in that they were produced in the same ancient context and often using the same language as those books that would eventually form the New Testament. Some of these later works are dependent (either directly or indirectly) upon books that would later come to be in the New Testament or upon the ideas expressed in them. There is even an example of a pseudepigraphical