According to Dionysius of Alexandria, writing in the third century, there were two memorials of John in Ephesus, and he suggested that there might have been two famous Johns who had lived in the province of Asia (whom he identifies as the authors of the Gospel of John and the book of Revelation respectively) (apud Eusebius, Hist. eccl. 7.25.16).
John’s ministry in Asia Minor and the Dating of John’s Gospel and Revelation
According to a number of ancient writers, John founded the bishoprics in the churches of the province of Asia.
What was the historical situation of these ordinations, according to early Christian tradition, and what can it tell us about when early sources placed the writing of the Gospel and Revelation of John?