Bifrons

Bifrons, also known as Bifrovs, is an Earl of Hell and one of the seventy-two demons described in the Ars Goetia, who commands either 6 or 26 legions of lesser demons. He appears as a monster, but can change into a man at the command of the exorcist and summoner. He is said to teach men arts and sciences, such as astrology and geometry, as well as the virtues of herbs and precious stones. He can also move bodies from one grave to another, and causes corpse candles to float above grvaes.