Dating authorship gospels
For my purposes I will look at the most relevant information from before A. Unfortunately, the questions of New Testament authorship and dating are not cut and dried. There is substantial variation in the writings of the church fathers.
The church fathers did not have the current understanding of history and authorship. To determine New Testament authorship as best we can, we use the earliest of the patristic sources augmented by the internal evidence of the New Testament.
In order to be able to use the patristic traditions to glean information, we must have a clear understanding of how their traditions changed with time.
At the origin of a tradition, there is the true story. Those who see or experience the events (eyewitnesses) tell others (second-hand witnesses) about it.
There are exceptions to this, but those exceptions are uncommon. Because of the theme of this writing, he spent more time discussing sources than most writers of this era. Understanding the source of these similarities is referred to as the synoptic problem. For the most part, later sections will rely on the Gospels because this is where almost all the sayings and actions of Jesus are, and Acts, because it focuses on the early history of the church. __________  My sources for this section and its subsections are Donald Guthrie, New Testament Introduction, Raymond E. However, it is not as surprising when we realize that oral cultures contain the entire wisdom and history of their people in oral form, so much care is employed.
In general, I will take the position that the patristic tradition is authoritative, unless the tradition itself is murky or it is contradicted by a clear and convincing textual argument from the New Testament. 170) is not a church father, exactly, but a document. The dominant understanding is that Matthew and Luke both separately had access to Mark, but not to each other. I included discussions of the letters because they give context and support to the Gospels, as well as demonstrate that Christianity existed as a movement by A. Brown, An Introduction to the New Testament, the 2003 version of the New Catholic Encyclopedia, the book The New Testament Documents: Are They Reliable?
It is likely that John was aware of the other Gospels, because his was the last written (see below).