Satan

Satan (the Devil) is the Lord of Chaos and Destruction, proprietor of the Underworld, as well as the primary patron of  Witchcraft. While the basis of what and who the Devil is has been a subject of intense debate for thousands of years, most religions, such as Christianity, believe the Devil to be the chief spirit of evil, while other traditions, such as Witchcraft, believe the Devil to be an anti-hero.

History
The Devil, is the fallen angel, Lucifer.