Allocer.
Allocer, also known as Alloces, is a demon whose title is Great Duke of Hell, and who has thirty-six legions of demons under his command. He induces people to immorality and teaches arts and all mysteries of the sky.
Description[]
He is described as appearing in the shape of a knight mounted on an enormous horse. His face has leonine characteristics; he has a ruddy complexion and burning eyes; and he speaks with much gravity. He is said to provide good familiars, and to teach astronomy and liberal arts. Allocer is often depicted riding a horse with dragon legs.