Cassiel is considered as an Archangel in Jewish mythology but some authors depict him as a demon.
Also known as Casiel, Casziel, Kafziel, Qafziel.
Cassiel is often included in lists as being one of the seven archangels and often associated with the Seventh Heaven, sometimes described as carrying the flag of Gabriel .
As a demon he may appear as a bearded king with wings, who rides on the back of a winged dragon, and carries in his right hand an arrow.
Cassiel is known as the Angel of Temperance and Good Fortune. He is associated with the following attributes: acceptance, wisdom, luck, purpose and positivity. His energy inspires us to expand our minds and think on a higher level. He helps to create peace and release disharmony in all situations.
...the nature of them (spirits of Saturday) is to sow discords, hatred, evil thoughts and cogitations, to give leave to kill and murder, and to lame or maim every member.
Those spirits who appear in a kingly form, have a much higher dignity than them who take an inferior shape; and those who appear in a human shape, exceed in authority and power them that come as animals; and again, these latter surpass in dignity them who appear as trees or instruments, and the like: so that you are to judge of the power, government, and authority of spirits by their assuming a more noble and dignified apparition. Francis Barrett - The Magus