An unusual image of the devil from the 13th-century Codex Gigas, made at the Podlažice monastery (O.S.B.) in Bohemia and currently at the National Library of Sweden.
The Codex Gigas is the largest known book created in the Middle Ages: over 36 inches high and nearly 20 inches wide. It is the work of a single author, known as Herman the Recluse.
Browse the entire digitized manuscript here: the initials are particularly lovely.