Demon Sallos is mentioned in several old occult sources. Below you will find a mix of useful information about Sallos and hopefully it will help you to summon this demon.
Demon Sallos: Goetia
The 19th spirit is Sallos. He is a Duke and appears in the form of a Soldier. Sallos rides upon a crocodile and he wears a crown upon his head. He comes in a peaceful way.
Sallos causes love between a woman and a man. This spirit rules over 30 legions of lesser spirits.
Sallos: Pseudomonarchia Daemonum
Saleos is a great Earl and he appears as a handsome soldier, riding on a crocodile. Sallos wears a dukes crown. He comes in peace.
Source: Johann Weyer, Pseudomonarchia Daemonum
Sallos: Daemonolatry Goetia
Sallos is the demon of love. He can be called upon during a wedding.
Source: Daemonolatry Goetia by S. Connolly
There are several “love demons” in the Goetia: Sallos, Sitri, Beleth, Zepar, Dantalion and Gremory. I have done many rituals with Sallos and Dantalion for clients, and these two demons can be summoned during manipulative love spells.
Dantalion can manipulate the thoughts of the target and he is very talented. Dantalion can also tame angry animals and even heal depressions in animals and in humans.
I have also done lust spells with Sitri for my clients. Sitri is very talented and he can make a man go crazy with desire for sex with you.
Sallos: when to summon him?
Sallos is ranked as a Duke. The Dukes of Goetia are matched to the Qlipha of Harab Serapel on the Qliphotic Tree. This place is ruled by the Archdemon Baal.
Please note, that the chart you see above is based on information from Clavicula Salomonis. If you know the Tree of Life with its 10 Sephiroth, then Sallos comes from Netzach.
Both Harab Serapel and Netzach are ruled by the planet Venus. I use the correspondences of Netzach even for Harab Serapel:
Ruling planet: Venus
Astrological hour: Venus
Paper seal colour: green
Metal seal: copper
Herb: cinnamon (my own choice)
The best day to summon Sallos for love spells is of course a Friday. You can fine tune your magick by doing it during the astrological hour of Venus.
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