Gadreel (Gâdreêl, Gadriel, Hebrew: גדר האל, romanized: Gader ha-el, lit. 'Wall of God') is a high ranking former Watcher from the Book of Enoch (1 Enoch) who is listed as a fallen angel.¹⁾ Not only is he listed as a former commander of the rebellious angels, he is also cited ²⁾ as being the angel who deceived Eve in the form of a serpent³⁾ in Genesis 3:4.

“CHAP. 69 (…) 3. And these are the heads of the angels, and the names of their chiefs over a hundred and the chiefs over fifty and the chiefs over ten. (…) 6. And the third is called Gâdreêl; he is the one who has taught the children of men all the blows of death, and led astray Eve, and showed to the children of men the instruments of death, the coat-of-mail and the shield and the sword for battle, and all the instruments of death to the sons of men. 7. And from his hand they have come over those who dwell on the earth, from that time to eternity”

(From the translated volume “The Book of Enoch”, Warren F. Draper, 1882)⁴⁾