Haagenti

In demonology Haagenti is a Great President of Hell, ruling thirty-three legions of demons. He makes men wise, instructing them in every subject, transmutes all metals in gold, and changes wine into water and water into wine.

Haagenti is depicted as a big bull with the wings of a griffin, changing into a man under request of the conjurer.

See also The Lesser Key of Solomon, Ars Goetia.