The Grimoire of Honorius

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This book was credited to Pope Honorius III, who succeeded Pope Innocent III in 1216.

The Grimoire of Honorius was full of Christian benedictions and formulae as well as more sinistrous requirements for animal sacrifice and instructions for obtaining a pact with the Devil.

 "It not only instructed priests in the arts of demonology but virtually ordered them to learn how to conjure and control demons, as part of their job."