In Christian demonology, the demon described as a Duke of Hell appearing in an angelic form is Astaroth.
Astaroth is a major figure in early modern European demonological literature and appears prominently in the Ars Goetia, the first section of the seventeenth-century grimoire The Lesser Key of Solomon. There he is identified as a powerful duke and is portrayed as an angelic figure riding an infernal beast resembling a dragon while holding a viper.
Descriptions vary by edition and translation: some call the angel beautiful, while others emphasize that the appearance is harmful, foul, or deceptive. This explains why Astaroth can be described both as angel-like and grotesque. The figure’s name is commonly connected with Ashtoreth or Astarte, an ancient Near Eastern goddess whose identity was reinterpreted through later demonology.
Astaroth is often confused with other Goetic nobles such as Paimon, Bael, and Beleth. Those are separate demons with their own ranks, appearances, and traditional powers.