Bishop Dionysius of Alexandria (mid-third century), one of Eusebius' heroes in his History of the Church, was a great bishop who led the church in times of plague and persecution. He was also a capable biblical scholar (a rare trait among bishops these days) and wrote about Revelation.
A certain Nepos, a bishop of Egypt, argued that the Scriptures should be interpreted in a more Jewish fashion and he took the hope for a millennium in Revelation 20 quite literally. Dionysius wrote a response to Nepos in a book called On Promises. I find two interesting things about what Dionysius says concerning the canonicity of Revelation and its authorship.
1. In contrast to some who attributed Revelation to Cerinthus, Dionysius says:
I, however, would not dare reject the book, since many brethren hold it in esteem, but since my intellect cannot judge it properly, I hold that its interpretation is a wondrous mystery. I do not understand it, but I suspect that the words have a deeper meaning. Putting more reliance on faith than on reason, I have concuded that they are too high for my comprehension. I do not reject what I have failed to understand, but am rather puzzled that I failed to understand.
That probably sums it up for many of us!
2. On authorship, Dionysius says this:
That, therefore, he was named John and that this book is by a John - some holy, inspired writer - I will not deny. But I do not agree that he was the apostle, the son of Zebedee, the brother of James, who wrote the Gospel according to John and the general epistle. From the character of each and on the style and format of [Revelation], I conclude that the author is not the same. For the Evangelist nowhere names himself in either the Gospel or Epistle in either the first or third persons, whereas the author of Revelation announces himself at the very beginning: "The revelation of Jesus Christ which he ... sent by his angel to his servant John."
(Eusebius, H.E.7.25)
