The church of San Cornelio and San Cipriano in Revilla de Santullán is relatively simple in its architectural design, with a single nave interior. The outstanding feature of this building is undoubtedly its sculpture. Now enclosed by a sixteenth century porch, the south portal is decorated with a remarkably well-preserved figural archivolt and capitals. The apostles and Christ are distributed within the arches of a miniature arcade, engaging in the Last Supper – most of the apostles are shown with different types of food in front of them. The final figure to the far right of the archivolt is a self-portrait of the sculptor, inscribed with his signature "MICHAELIS ME FECIT". The capitals below show a host of fantastical creatures. Chainmail-clad soldiers furiously battle these beasts, allegorizing the never-ending fight between good and evil.