(Gaap, from Collin de Plancy's Dictionnaire Infernal, 1863)

This demon is also sometimes known as Tap. The text of the Lemegeton reads: "he is a President; and a mighty Prince; he appeareth when the Sun is in some of the Southern Signs in a humane shape; Going before him 4 Great and Mighty Kings knowing Philosophy; and all the Liberal Sciences; he can cause love or hatred, and make men insensible; he cann teach you how to Consecrate those things that belong to the Dominion of Amaymon his King, and cann deliver familiars out of the Custidy of other Magicians; and men most speddly an Kingdom to Another at the will and pleasure of the Exorcist; he ruleth 66 Legions of Spirits; he was of the Order of Potentates;" (Sloane 2731).

Reginald Scot has some curious lore to record in connection with this demon. He states that Gaap is equal in might to Bileth, and writes of the latter spirit: "there were certaine necromancers that offered sacrifices and burnt offerings unto him; and to call him up, they exercised an art, saieng that Salomon the wise made it. Which is false: for it was rather Cham, the sonne of Noah, who after the floud began first to invocate wicked spirits. He invocated Bileth, and made an art in his name, and a booke which is knowne to manie mathematicians. There were burnt offerings and sacrifices made, and gifts given, and much wickednes wrought by the exorcists, who mingled therewithall the holie names of God, the which in that art are everie where expressed. Marie there is an epistle of those names written by Saloman, as also write Helias, Hierosolymitanus and Helisaeus. It is to be noted, that if anie exorcist have the art of Bileth, and cannot make him stand before him, nor see him, I may not bewaie you and declare the meanes to containe him, bicause it is abhomination, and for that I have learned nothing from Salomon of his dignitie and office."

What the abominations used to command Bileth may be, Scot does not divulge. They may have involved the spilling of human blood. Bileth is evidently the same as the demon Beleth, also known as Bileth or Bilet. Scot's text is confusing, and it is difficult to know with certainty at any given point whether he is writing about Gaap or Bileth, but I believe Bileth to be intended in the section quoted above. Gaap and Bileth are two of the four chief demons that rule over the 72 commanded by Solomon into the vessel of brass. The other two rulers are Belial and Asmoday.

Collin de Plancy has caused Gaap to be illustrated as a winged giant with horns and a tail, who carries a man through the air on his shoulders.