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 Goeti...