Sammael is an important archangel in Talmudic and post-Talmudic lore, as well as Christian tradition and demonology, a figure who is accuser, seducer and destroyer, and has been regarded as both good and evil. It is said that he was the guardian angel of Esau and a patron of the sinful empire of Rome. Also called Samael and Samil (and is even sometimes confused with Satan) he is considered in legend both a member of the heavenly host (with often grim and destructive duties) and a fallen angel, equatable with Satan and the chief of the evil spirits.
One of Sammael's greatest roles in Jewish lore is that of the Angel of Death. In this capacity he is a fallen angel but nevertheless remains one of the Lord's servants. As a good angel, Sammael supposedly resides in the seventh heaven, although he is declared to be the chief angel of the fifth heaven.