John of Patmos

Christian tradition has considered the Book of Revelation's writer to be the same person as John the Apostle, though some Christian scholars since medieval times have separated the disciple from the writer of Revelation. A minority of ancient clerics and scholars, such as Eusebius (d. 339/340), recognize at least one further John as a companion of Jesus, John the Presbyter.

Island of Patmos

John is considered to have been exiled to Patmos during a time of persecution under the Roman rule of Domitian in the late 1st century. Revelation 1:9 states: "I, John, both your brother and companion in tribulation...was on the island that is called Patmos for the word of God and for the testimony of Jesus Christ."

Adela Yarbro Collins, a biblical scholar at Yale Divinity School, writes:

Early tradition says that John was banished to Patmos by the Roman authorities. This tradition is credible because banishment was a common punishment used during the Imperial period for a number of offenses. Among such offenses were the practices of magic and astrology. Prophecy was viewed by the Romans as belonging to the same category, whether Pagan, Jewish, or Christian. Prophecy with political implications, like that expressed by John in the Book of Revelation, would have been perceived as a threat to Roman political power and order. Three of the islands in the Sporades were places where political offenders were banished. (Pliny, Natural History 4.69–70; Tacitus, Annals 4.30)

According to Tertullian (in The Prescription of Heretics) John was banished after being plunged into boiling oil in Rome and suffering nothing from it.