Samael (סַמָּאֵל, Sammāʾēl, "Venom/Poison of God"; سمسمائيل, Samsama'il or سمائل, Samail; alternatively Smal, Smil, Samil, or Samiel) is an archangel in Talmudic and post-Talmudic lore; a figure who is the accuser or adversary (Satan as mentioned in the Book of Job), seducer, and destroyer (Mashhit as mentioned in the Book of Exodus).
Although many of his functions resemble the Christian notion of Satan, to the point of being sometimes identified as a fallen angel, he is not necessarily evil, since his functions are also regarded as resulting in good, such as destroying sinners.
He is considered in Midrashic texts to be a member of the heavenly host with often grim and destructive duties. One of Samael's greatest roles in Jewish lore is that of the main angel of death and the head of satans. Although he condones the sins of man, he remains one of God's servants. He appears frequently in the story of the Garden of Eden and engineered the fall of Adam and Eve with a snake in writings during the Second Temple period. However, the serpent is not a form of Samael, but a beast he rode like a camel. In a single account he is also believed to be the father of Cain, as well as the partner of Lilith. In early Talmudic and Midrashic literature he is not identified with Satan yet. Only in later Midrashim he is entitled "head of satans".
As guardian angel and prince of Rome, he is the archenemy of Israel. By the beginning of Jewish culture in Europe, Samael had been established as a representative of Christianity, due to his identification with Rome.
In some Gnostic cosmologies, Samael's role as source of evil became identified with the Demiurge, the creator of the material world. Although probably both accounts originate from the same source, the Gnostic development differs from the Jewish development of Samael, in which Samael is merely an angel and servant of God.
Samael was first mentioned during the Second Temple Period and immediately after its destruction. He is apparently first mentioned in the Book of Enoch along with other rebellious angels.