Dionysius of Alexandria, on Acts 13:13

“Now when Paul and they that were with him had sailed from Paphos, they came to Perge in Pamphylia. And John departing from them, returned to Jerusalem.”

“There is, besides, another John mentioned in the Acts of the Apostles, with the surname Mark, whom Barnabas and Paul attached to themselves as companion, and of whom again it is said: "And they had also John to their minister." But whether this is the one who wrote the Revelation, I could not say. For it is not written that he came with them into Asia. But the writer says: "Now when Paul and his company loosed from Paphos, they came to Perga in Pamphylia: and John, departing from them, returned to Jerusalem." I think, therefore, that it was some other one of those who were in Asia. For it is said that there were two monuments in Ephesus, and that each of these bears the name of John.”

Imported from an open dataset — not yet checked against the printed edition.