Neberius.
He is supposedly the most valiant Marquis of Hell, 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 according to Johann Wier he procures the loss of them.
The 24th spirit of the Goetia, 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 is depicted as a crow or black crane.