When, and By Whom, Was the Gospel of John Written?
THE GOSPEL OF JOHN WAS WRITTEN MUCH LATER THAN THE OTHER GOSPELS
The writer of John apparently had the other three Gospels, Matthew, Mark, and Luke, before him as he wrote, and he tried to fill in some of the gaps, because about 92% of the book of John contains unique material. Clement of Alexandria, who lived in the late 100’s to early 200’s, reported that John wrote to supplement the accounts found in the other Gospels. “Last of all, John, perceiving that the external facts had been made plain [in the other canonical gospels] . . . composed a spiritual gospel” (Eusebius, Ecclesiastical History, 6.14.7). This, of course, means that the Gospel of John was written after Matthew, Mark, and Luke.