The Book of Revelation (also known as the Apocalypse of John, Revelation to John, or Revelation from Jesus Christ) is the final book of the Christian Bible, as well as the final book of the New Testament. It describes a vision that John the Apostle saw in the year A.D. 95 while he was exiled on the island of Patmos by the Roman emperor Domitian. Revelation 1:1 states that its message is from Jesus Christ and Him alone, thus defining it as a biblical prophecy. It was probably written down very quickly after it was received, often within hours or days of being sent back from heaven. The author was most likely the apostle John, who was living in exile on the island of Patmos during the reign of Domitian (A.D. 81-96). According to tradition, John kept a diary where he recorded all his visions, but this has not been proven conclusively. No other documents from the first century have been found which contain any predictions about the future, so we can only estimate when certain events might have taken place through analysis of historical data and knowledge of the time frame in which they occurred. In addition to describing a vision, Revelation also includes some instructions for its interpretation.