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The Sworn Book of Honorius (Latin: Liber juratus Honorii, also Liber sacer, sacratus or consecratus) is a medieval grimoire purportedly written by Honorius of Thebes. The Latin word juratus, which is typically translated "sworn", is intended to mean "oathbound". It was allegedly the grimoire of Pope Honorius I, hence its name.
The book is one of the oldest existing medieval grimoires as well as one of the most influential.