Casiet: One of several demons said to serve in the court of the west beneath the infernal king Malgaras. Casiet holds the rank of chief duke and commands thirty ministering spirits. According to the Ars Theurgia, he is tied to the hours of the day and will only manifest during these hours. The name of this demon may have been generated through scribal error, as it is one letter off from the more common name Casiel.
SOURCE:
The Dictionary of Demons written by Michelle Belanger