The demon Dantalion appears in the grimoires Book of Incantations, The Cambridge Book of Magic, The Grimoire of Arthur Gauntlet, and The Lesser Key of Solomon
From The Lesser Key of Solomon, Crowley/Mathers edition:
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 Counsels 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.
Timeline of related events
1641Publication of the Lesser Key of Solomon (lists this demon)