This project brings together five editions of a relatively under-studied grimoire, the
"Enchiridion Leonis Papæ", and analyses them for the first time in an academic format. The analysis examines what little has been written about the "Enchiridion Leonis Papæ" as well as its legendary associations with Pope Leo III and the Frankish king, Charlemagne. The project investigates the origins of this little book of magic and how, although published in the sixteenth century, it comes from the world of medieval magic and faith. A transcript of several excerpts from the "Enchiridion Leonis Papæ" is included in the appendices in order to help the reader in understanding the argument of the paper.