Ariel: Appears as a treasure-finding spirit in the Sixth and Seventh Books of Moses. He is included among the Seven Great Princes of Spirits who, the text warns, include among their number some of the highest-ranking angels to have fallen from grace.
In wider literature on angels and demons, Ariel appears among the fallen as well as those still loyal to the Throne of God. Ariel's name means “Lion of God,” and this leonine aspect is often reflected in magickal texts-where he is frequently described as possessing the head of a lion.
SOURCE:
The Dictionary of Demons written by Michelle Belanger