The name Azazel first appears in the Hebrew Bible (Leviticus 16:8) - its meaning can mean "God strengthens", but also "impudent to God". In the Book of Enoch, Azazel was described as one of the Grigori, a fallen angel, who married human women. In Modern Hebrew, '"lekh l'Azazel" (לך לעזאזל) is the equivalent of the English curse "go to Hell".' He is said to be the prinicpal standard-bearer of the infernal armies, and ranks quite high in the ranks of Hell's Hierarchy.

Click here to learn more about him as a character in Supernatural Season One and Season Two.