Summary on Canon
¥Thus the evidence is clear that Constantine did not suddenly set off in a new direction, putting together another Bible.
¥Rather, the four Gospels had been recognized by orthodox Christians as authoritative for at least 150 years.
¥Final decisions on the exact boundaries of the NT canon are made in the generation following Constantine, but this involves only one book that could be called a gospel, namely the Gospel of the Hebrews.