Bileth is a great and terrible king in Hell commanding eighty-five legions of subordinate demons. He belongs to the Order of Dominions and retains hopes on someday returning to the seventh throne of Heaven.
In Wierus’ Pseudomonarchia Daemonum Bileth name is Byleth. According to both this work and Scot’s Discoverie of Witchcraft he can embroil people into foolish and misguided love, and he can be tricky to command.
When the demon is summoned he puts on a furious appearance to fool the magickan. This is accompanied by a trumpet fanfare with Bileth astride a pale horse.
The magickan is not to be fooled by this manifestation but is to control the demon by holding a hazel rod in his right hand until the demon manifest more amiably. The demon is to be contained in a specially constructed outside of the summoning circle.
If room does not permit such construction the magickan is instructed by both the Pseudomonarchia Daemonum and Scot’s Discoverie of Witchcraft to place a bowl of wine outside of the circle to entice the demon.
For the magickan’s protection a magickan ring is to be used as with Amaimon. All this effort is valuable because once Bileth’s prideful ego is appeased he becomes his best friend and is very obedient.
The Pseudomonarchia Daemonum attributes Bileth to be the first necromancer. According to this legend Noah’s son Cham (Shem) founded necromancy and Bileth was the first demon conjured.
The art was named for him which was decried an abominable and wicked practice by the author of Wierus’ source text. The Pseudomonarchia Daemonum also gives variations of Bilrth such as Byleth and Beleth.
Also he is associated with King Solomon’s Brazen Vessel. It is the chief of the seventy-two infernal kings which the Biblical King had captive in the vessel.
By the name Beleth he appears as the thirteenth spirit in the Goetia. In the Goetia of Dr. Rudd he is said to be constrained by the angel Jezalel.
In the Liber de Angelis Bileth name is Bilet. He is referred to as the king of Hell, controls demons associated with suffering and disease.
Belanger, Michelle. The Dictionary of Demon: Names of the Damneds. Llewellen Publications. 2010. ebook.