The demon of lust and unfaithfulness. He is depicted as a fire-breathing creature with three heads: the first one resembling that of a bull, the second that of a man, and the third that of a ram, feet like a goose and a serpent tail. He rides a dragon and holds in his hand a Lance with a Banner. He is one of the seven archdemons in Persian mythology and controls 72 legions of the Amaymon army.
He teaches men the art of becoming invisible, as well as instructing them in geometry, arithmetic, astrlogy, and the mechanical sciences. He has vast knowledge concerning buried treasures, and can be forced to reveal their site with the help of appropriate spells and incantations. (from Mystical Creature A Day)