Gaap teaches Philosophy and all liberal sciences, can cause love or hate and make men insensible and invisible, deliver familiars out of the custody of other magicians, teaches how to consecrate those things that belong to the dominion of Amaymon his king (there is hear a contradiction, see above), gives true answers concerning past, present and future, and can carry and re-carry men and thing speedily from one nation to another at the conjurer's will. According to a few authors he can make men ignorant.
According to Pseudomonarchia Daemonum certain necromancerss honour him with sacrifices and burning offerings.
He is depicted in human shape.
Other spellings: Goap, Tap.