In demonology, Buer is a Great President of Hell, having fifty legions of demons under his command. He appears when the Sun is in Sagittarius. Buer teaches Natural and Moral Philosophy, Logic, and the virtues of all herbs and plants. He also heals all infirmities, especially of men, and gives good familiars. According to other authors he teaches Medicine, and has the head of a lion and five goat legs surrounding his body to walk in every direction.
Although the etymology of his name is uncertain, curiously there was an ancient city named "Buer" (now Gelsenkirchen) in Westphalia, Germany.