These books are called Matthew, Mark, Luke, and John because they were traditionally thought to have been written by Matthew, a disciple who was a tax collector; John, the "Beloved Disciple" mentioned in the Fourth Gospel; Mark, the secretary of the disciple Peter; and Luke, the traveling companion of Paul.

Did John write the Synoptic Gospels?

John's is the only one of the four not considered among the Synoptic Gospels (i.e., those presenting a common view). Although the Gospel is ostensibly written by St. John the Apostle, “the beloved disciple” of Jesus, there has been considerable discussion of the actual identity of the author.

When were the gospels written and by whom?

They were probably written between AD 66 and 110. All four were anonymous (the modern names were added in the 2nd century), almost certainly none were by eyewitnesses, and all are the end-products of long oral and written transmission.