John of Patmos (also called John the Revelator, John the Divine, John the Theologian; Ancient Greek: Ἰωάννης, romanized: Iōannēs) is the name traditionally given to the author of the Book of Revelation. Revelation 1:9 states that John was on Patmos, a Greek island where, according to most biblical historians, he was exiled as a result of anti-Christian persecution under the Roman emperor Domitian. Christian tradition has considered the Book of Revelation's writer to be John the Apostle, purported author of the Gospel of John. A minority of senior clerics and scholars, such as Eusebius (d. 339/340), recognize at least one further John as a companion of Jesus, John the Presbyter. Some Christian scholars since medieval times separate the disciple from the writer of Revelation. Source: Wikipedia (en)