Key of Solomon
 The Key of Solomon is divided into two books. It describes not the appearance or work of any spirit but only the necessary drawings to prepare each "experiment" or, in more modern language, magical operations. Unlike later grimoires such as the Pseudomonarchia Daemonum (16th century) or the Lemegeton (17th century ), the Key of Solomon does not mention the signature of the seventy-two spirits constrained by King Solomon in a bronze vessel. As in most medieval grimoires, all magical operations are ostensibly performed through the power of God, to whom all the invocations are addressed. Before any of these operations (termed "experiments") are performed, the operator must confess his sins and purge himself of evil, invoking the protection of God. Elaborate preparations are necessary, and each of the numerous items used in the operator's "experiments" must be constructed of the appropriate materials obtained in the prescribed manner, at the appropriate astrological time, marked with a specific set of magical symbols, and blessed with its own specific words. All substances needed for the magic drawings and amulets are detailed, as well as the means to purify and prepare them. Many of the symbols incorporate the Transitus Fluvii occult alphabet.