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In demonology, Dantalion (or Dantalian) is a powerful Great Duke of Hell, with thirty-six legions of demons under his command; a Jinn, he is the 71st of 72 spirits of Solomon. He teaches all arts and sciences, and also declares the secret counsel of anyone, given that he knows the thoughts of all people and can change them at his will. He can also cause love and show the similitude of any person, show the same by means of a vision, and let them be in any part of the world they will.
He is depicted as a man with many appearances, which means the faces of all men and women. There are also many depictions in which he is said to hold a book in one of his hands, such as the following, from The Lesser Key of Solomon:
"The Seventy-first Spirit is Dantalion. He is a Duke Great and Mighty, appearing in the Form of a Man with many Countenances, all Men's and Women's Faces; and he hath a Book in his right hand. His Office is to teach all Arts and Sciences unto any; and to declare the Secret Counsel of any one; for he knoweth the Thoughts of all Men and Women, and can change them at his Will. He can cause Love, and show the Similitude of any person, and show the same by a Vision, let them be in what part of the World they Will. He governeth 36 Legions of Spirits; and this is his Seal, which wear thou, etc."
- S. L. MacGregor Mathers, A. Crowley, The Goetia: The Lesser Key of Solomon the King (1904). 1995 reprint: ISBN 0-87728-847-X.