Commentary on the Apocalypse

Commentary on the Apocalypse (Commentaria In Apocalypsin) is a book written in the eighth century by the Spanish monk and theologian Beatus of Liébana (730–785) and copied and illustrated in manuscipt in works called "Beati" during the 10th and 11th Centuries a.d. It is a commentary on the New Testament Apocalypse of John or Book of Revelation. It also refers to any manuscript copy of this work, especially any of the 27 illuminated copies that have survived. It is often referred to simply as the Beatus. The historical significance of the Commentary is made even more pronounced since it included a world map, which offers a rare insight into the geographical understanding of the post-Roman world. Well-known copies include the Morgan, the Saint-Sever, the Gerona, the Osma and the Madrid (Vitr 14-1) Beatus codices.

Considered together, the Beatus codices are among the most important Spanish manuscripts and have been the subject of extensive scholarly and antiquarian enquiry. The illuminated versions now represent the best known works of Mozarabic art, and had some influence on the medieval art of the rest of Europe.

The work consists of several prologues (which differ among the manuscripts) and one long summary section (the "Summa Dicendum") before the first book, an introduction to the second book, and 12 books of commentary, some long and some very short. Beatus states in its dedication to his friend Bishop Etherius that it is meant to educate his brother monks.

The work is structured around selections from previous Apocalypse commentaries and references by Ticonius (now mostly lost), St. Primasius of Hadrumentum, St. Caesarius of Arles, St. Apringius of Beja, and many others. There are also long extracts from the texts of the Fathers of the Church and Doctors of the Church, especially Augustine of Hippo, Ambrose of Milan, Irenaeus of Lyons, Pope Gregory I, Saint Jerome of Stridon, and Isidore of Seville. Some manuscripts add commentaries on the books of Ezekiel and Daniel by other authors, genealogical tables, and the like, but these are not strictly part of the Beatus.

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