Dating the gospel of mark
Another clue is that the author of Mark seems to have known Paul’s epistles, making the date of Mark’s Gospel later than the epistles.The consensus of scholars is that Mark’s Gospel was written approximately 70 CE, give or take perhaps two or three years.Matthew is considered earlier than Luke because it is in some respects closer to Mark, including that the anti-Jewish rhetoric of Luke then John is less evident in Matthew.
John’s Gospel shows clear signs of having been revised, probably at least twice, but also probably by the original author.* The term ‘synoptic problem’ refers to the fact that when the Gospels of Matthew, Mark and Luke are laid in parallel and read synoptically (‘with the same eye’), it becomes evident that there is a literary dependency among them.
Clement of Alexandria, on the other hand, makes it clear that Mark wrote the gospel during the life-time of Peter.