How do we know The Gospel's were written in the first century

We know the Gospels (Matthew, Mark, Luke and John) were written within the first century for two reasons.

I) The Gospels were very often quoted by early Christians in the 2nd, 3rd and 4th century's. They are quoted so often in fact that almost the whole New Testament is quoted.


II) The Gospels reflect the religious views, political views and the culture of Judea, Samaria and Galilee.
See examples:


The case for Marks Gospel

The dating of The Gospels

Gospel                Earliest dating           Latest dating

Matthew               50 AD                        70 AD

Mark                     ...

Luke                      ...

John                      ...