The demon Belial appears in the grimoires Book of Incantations, The Cambridge Book of Magic, The Discoverie of Witchcraft, The Black Books of Elverum, The Magus, Munich Manual of Demonic Magic, The Book of the Office of Spirits, Three Books of Occult Philosophy, The Book of Abramelin, The Book of Oberon, Pseudomonarchia Daemonum, The Lesser Key of Solomon, and Paradise Lost
From The Lesser Key of Solomon, Crowley/Mathers edition:
The Sixty-eighth Spirit is Belial. He is a Powerful King, and was created next after Lucifer. He appeareth in the Form of Two beautiful Angels sitting in a Chariot of Fire. He speaketh with a Comely Voice, and declareth that he fell first from among the worthier sort, that were before Michael, and other Heavenly Angels. His Office is to distribute Presentations and Senatorships, etc., and to cause favour of Friends and of Foes. He giveth excellent Familiars, and governeth 80 Legions of Spirits. Note well that this King Belial must have Offerings, Sacrifices and Gifts presented unto him by the Exorcist, or else he will not give True Answers unto his Demands. But then he tarrieth not one hour in the Truth, unless he be constrained by Divine Power. And his Seal is this, which is to be worn as aforesaid, etc.
The spell To conjure up the evil spirits to force a thief to return that which he has stolen invokes this demon.
This demon is associated with the direction West
Timeline of related events
1531Publication of Agrippa's Three Books of Occult Philosophy (lists this demon)
1536Publication of De praestigiis daemonum (lists this demon)
1563First known appearance of The Book of the Office of Spirits (lists this demon)
1577Book of Oberon completed (lists this demon)
1584Publication of The Discoverie of Witchcraft (lists this demon)
1608Publication of the Book of Abramelin (lists this demon)
1641Publication of the Lesser Key of Solomon (lists this demon)
1667Publication of Paradise Lost (lists this demon)