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In the Ars Goetia, the first book of The Lesser Key of Solomon (17th century), he is depicted as a wolf with gryphon's wings and a serpent's tail, spewing fire from his mouth, but at the request of the magician he may take the form of a man.
They are each named after one of the 72 demons of the Ars Goetia: Alloces, Bune, Avnas, and Forneus.