The demon Naberius was first mentioned by Johann Wier in 1583. He is supposedly the most valiant Marquis of Hell, and has nineteen legions of demons under his command. He makes men cunning in all arts (and sciences, according to most authors), but especially in rhetoric, speaking with a hoarse voice. He also restores lost dignities and honors, although to Johann Weyer he procures the loss of them.
Naberius appears as a three headed dog or a raven. He has a raucous voice but presents himself as eloquent and amiable. He teaches the art of gracious living. He has also been depicted as a crow or a black crane.
"Naberius [Naberus], alias Cerberus, is a valiant marquesse, shewing himselfe in the forme of a crowe, when he speaketh with a hoarse voice: he maketh a man amiable and cunning in all arts, and speciallie in rhetorike, he procureth the losse of prelacies and dignities: nineteene legions heare (and obeie) him."
Other spellings: Cerberus, Cerbere, Naberus, Nebiros.
See also 
- S. L. MacGregor Mathers, A. Crowley, The Goetia: The Lesser Key of Solomon the King (1904). 1995 reprint: ISBN 0-87728-847-X.