This is the fourth in the series of catalogues that present detailed descriptions and complete cycles of illustrations of all existing manuscripts of the Commentary on the Apocalypse written by the eight-century Spanish monk Beatus.

"These volumes are produced, as one would confidently expect from Harvey Miller Publishers, to a very high standard... John Williams makes a substantial contribution to an overdue appreciation of the creative achieve- ment of the kingdoms of Northern Spain in the Early Middle Ages."  (Times Literary Supplement)

"This is a book that every specialist and every research lirary must own."      (L.G. Freeman in American Academy of Reasearch Historians on Medieval Spain Newsletter)

"The present volume reproduces six copies (Osma, Turin, Silos, Corsini, León and Berlin) made in the eleventh and twelfth centuries. It maintains the quality standards set in the first three volumes, including informative background material Williams has heretofore provided. Many of the illustrations are drawn from manuscripts that have never before been published. It offers rich insights into the art and life of these centuries, extraordinarily valuable for historians of art and theology, and is strongly recommended."    
(J. F. Powers in Choice)