
Demon Gaap (Gäap) is described in the Goetia and in the Pseudomonarchia Daemonum. Gaap is also mentioned in The Discoverie of Witchcraft and in some other old Occult books.
Below you will find a mix of information about Gaap and hopefully you will be able to summon this demon. So lets begin talking about Gaap.
Demon Gaap: Goetia
Gaap is the 33rd spirit and he is ranked both as a President and as a Prince. He is good at making men insensible or ignorant. He is also good at making men knowing in philosophy and all other liberal sciences.
He can cause love or hatred and he can also teach you to consecrate those things that belong to the dominion of King Amaymon.
Gaap can deliver Familiar spirits out of the custody of other magicians, and he also gives reliable information about the issues and events of the past, the present and the future.
This spirit can transfer men very fast from one country to another. 66 legions of spirits obey Gaap.
Source: Goetia
Gaap: Pseudomonarchia Daemonum

Gaap is also known as Tap and he is ranked both as a President and as a Prince. He appears in the form of a doctor when he takes on human shape.
He is the best doctor of women and he makes them burn with love for men. Gaap makes a person wonderfully knowing in philosophy and all other liberal sciences.
Gaap causes love, hatred, insensibility and invisibility. He aids in consecration of those things that belong unto the domination of Amaymon.
He delivers Familiars out of the possession of other magicians, and also answers truly of things past, present and to come. Gaap can transfer people from country to country very fast. He also rules 66 legions of spirits.
Source: Johann Weyer, Pseudomonarchia Daemonum
Gaap: Daemonolatry Goetia
Summon Gaap to neutralise the magick of others.
Source: Daemonolatry Goetia by S. Connolly
The correspondences: Mercury

Gaap is ranked as a President. The Presidents of the Goetia come from Qlipha Samael. This Qlipha is the shell of Sephira Hod. The latter is ruled by the planet Mercury and therefore I summon the Presidents during Wednesdays.
In my magick with the Presidents of Goetia, I use the correspondences of Hod even for Qlipha Samael:
Ruling planet: Mercury
Day: Wednesday
Astrological hour: Mercury
Paper seal colour: orange
Number in magick: 8 ( for example 8 oranges)
Plant: Orchid
The best occasion for rituals with Gaap is a Wednesday. You can fine-tune your magick by doing it during the astrological hour of Mercury.
The correspondences: Jupiter

The shell of Sephira Chesed is called Gamchicoth. The Princes and Prelates of Goetia, including Gaap, come from Gamchicoth. This shell is ruled by planet Jupiter.
The Princes and Prelates of the Goetia are summoned during Thursdays, because planet Jupiter rules Thursdays. Also, it would be great if you can summon the Princes and Prelates of the Goetia during the astrological hour of Jupiter.
I use the correspondences of Chesed even for Gamchicoth:
Ruling planet: Jupiter
Day: Thursday
Astrological hour: Jupiter
Paper seal colour: blue
Metal: tin
Gems: sapphire & amethyst
Number: 4 (4 candles for example)
Plant: olive (use olive oil)
Scent: cedar (I use cinnamon)
So, as you see, Gaap can be summoned both during Wednesdays and during Thursdays. This is because of his double ranking: President and Prince.
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