The demon Naberius was first mentioned by Johann Weyer in 1583. He is supposedly the most valiant Marquess 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 honours, 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.