The final book of the New Testament is the Book of Revelation , also known as the Apocalypse of John. In the New Testament canon, it is considered prophetical or apocalyptic literature . Its authorship has been attributed either to John the Apostle (in which case it is often thought that John the Apostle is John the Evangelist , . author of the Gospel of John ) or to another John designated " John of Patmos " after the island where the text says the revelation was received (1:9). Some ascribe the writership date as circa 81–96 AD, and others at around 68 AD.  The work opens with letters to seven churches and thereafter takes the form of an apocalypse , a literary genre popular in ancient Judaism and Christianity.