Zabriel
Zabriel: A demon accorded the title of duke. Zabriel is ruled by Carnesiel, the infernal Emperor of the East. According to the Ars Theurgia, Zabriel can be compelled in the name of his master to assume visible form, although a scrying mirror or crystal glass will aid greatly in perceiving this manifestation.
SOURCE:
The Dictionary of Demons written by Michelle Belanger