This thirteenth century prayer book contains erased texts that were written several centuries earlier, including two treatises by Archimedes that can be found nowhere else, The Method and Stomachion. MITH worked with the Walters Art Museum to develop an interactive interface for the detailed study of this manuscript.

To make this prayer book, scribes used parchment that had already been used for the writings of other books. They used a book containing at least seven treatises by Archimedes, a book with two speeches by Hyperides, fragments of a philosophical text most likely written by Alexander of Aphrodisias, fragments from a Life of St. Pantoleon, fragments from a Menaion, and two unidentified texts.