Where did John write the Book of Revelation?

Revelation 1:1 says that the Book of Revelation was written by John, a servant of Jesus Christ in Patmos, but does not really say who John was. At some stage in the second century, the fourth Gospel was attributed to the apostle John, and Revelation was subsequently attributed to the same author because of the similarity of name. It has also been pointed out that, alone in the New Testament, these two books refer to Jesus Christ as the Lamb. On these fragile grounds, Revelation has long been attributed to the author of John's Gospel, in spite of the differences in style and theology.

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