Pseudomonarchia Daemonum

 The Pseudomonarchia predates, and differs somewhat from, Ars Goetia. The Pseudomonarchia lists sixty-nine demons (in contrast to the later seventy-two), and their sequence varies, along with some of their characteristics. The demon Pruflas appears only in Pseudomonarchia, and Pseudomonarchia does not attribute any sigils to the demons.

Weyer referred to his source manuscript as Liber officiorum spirituum, seu Liber dictus Empto. Salomonis, de principibus et regibus daemoniorum. (Book of the offices of spirits, or the book called 'Empto'. Solomon, concerning the princes and kings of demons.) This work is likely related to a very similar 1583 manuscript titled The Office of Spirits, both of which appear ultimately be an elaboration on a fifteenth-century manuscript titled Le Livre des Esperitz (of which 30 of its 47 spirits are nearly identical to spirits in the Ars Goetia).