The belief in the reality of demons and the restless dead formed a central facet of the medieval worldview. Whether a pestilent-spreading corpse mobilised by the devil, a purgatorial spirit returning to earth to ask for suffrage, or a shape-shifting demon intent on crushing its victims as they slept, encounters with supernatural entities were often met with consternation and fear. Chroniclers, hagiographers, sermon writers, satirists, poets, and...