The Apostle John is certainly the author of the Gospel of John. Up until the 1700s, St. John the Theologian was universally accepted as the author of the Gospel of John. Ancient manuscripts label John the Apostle as the Gospel’s author. Church Fathers Bishop St. Irenaeus of Lyons, Bishop St. Theophilus of Antioch, Bishop St. Papias of Hierapolis, St. Clement of Alexandria, attest to this fact. The author of the Fourth Gospel avoids mentioning his name during incidents in which the Apostle John was involved [John 1:37-40; 18:15; cf. 20:3-10]. The style of the Gospel indicates that the author was an eyewitness to the events. The author is the “disciple whom Jesus loved” [John 19:26; cf. 19:35]. In John 21:24, the author affirms that St. John the Apostle is the author of the entire Gospel. The striking similarity in teaching, style, and language between the Gospel of John and 1, 2, and 3 John–which are written by the “presbyter”–show that St. John the Apostle wrote the Fourth Gospel. The same St. John was the author of Revelation [Revelation 1:1,4,9; 22:8].