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.
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Before his fall he belonged to the angelic order of Dominations (or Dominions), and when he was bound by Solomon he told him that after 1,200 years he hoped to return to Heaven ("unto the Seventh Throne").