The Apostle John, James' brother,
often called 'the beloved' is the
author of this book called
Revelation of Jesus Christ.

While he was praying and worshiping
God (when he was in exile on the Isle
of Patmos) he recorded the visions
that God revealed to him there.

At this time John is old; all the other
apostles are gone (martyrs); Jerusalem
has been destroyed and the church has
been dispersed. Surely being all alone
he was looking forward to heaven.