The Book of Revelation
The word “apocalypse” originally meant (in Greek) revelation; something unveiled or revealed. It has come to mean the end of the world because the Book of Revelation is about that event. Revelation was the last book added to the canon, and its place there has been disputed at various times, for example by Martin Luther. The Book of Revelation itself claims to be written by an author called John, and while early Christians understood this to be the apostle, modern scholars think it is highly unlikely to be either the apostle or the author of the Gospel of John. John was a very common name, however, so it is quite possible John was his name. The events described seem to date the work fairly exactly to AD 95, but while the Gospel of John is very much a gentile work, distancing itself from the Jews, this is very much a Jewish work (perhaps why it was rejected by Luther). As such, it harkens back to the earliest days of Christianity, and indeed to the apocalyptic genre of Daniel. The ...