In a monastery in the mountains of northern Spain, 700 years after the Book of Revelations was written, a monk set down to illustrate a collection of writings he had compiled about this most vivid and apocalyptic of the New Testament books. Throughout the next few centuries his depictions of multi-headed beasts, decapitated sinners, and trumpet blowing angels, would be copied over and over again in various versions of the manuscript. John Williams, author of *The Illustrated Beatus*, introduces Beatus of Liébana and his Commentary on the Apocalypse.