In this original, provocative, well-reasoned, and thoroughly documented book, Frank Klaassen proposes that two principal genres of illicit learned magic occur in late medieval manuscripts: image magic, which could be interpreted and justified in scholastic terms, and ritual magic (in its extreme form, overt necromancy), which could not. Image magic tended to be recopied faithfully; ritual magic tended to be adapted and reworked. These two forms of magic did not usually become intermingled in the manuscripts, but were presented separately. While image magic was often copied in the...

In this original, provocative, well-reasoned, and thoroughly documented book, Frank Klaassen proposes that two principal genres of illicit learned magic occur in late medieval manuscripts: image magic, which could be interpreted and justified in scholastic terms, and ritual magic (in its extreme form, overt necromancy), which could not. Image magic tended to be recopied faithfully; ritual magic tended to be adapted and reworked. These two forms of magic did not usually become intermingled in the manuscripts, but were presented separately. While image magic was often copied in the...