Aspiel: A servant of the infernal king Malgaras.
Aspiel appears in the Ars Theurgia, where he is said to hold the rank of chief duke. He governs thirty lesser spirits and will only deign to appear during the hours of the night. He is affiliated with the court of the west. Aspiel also appears in this same work in the capacity of a duke serving beneath the demon Asyriel. Here, Aspiel is said to serve during the hours of the night, with ten lesser spirits to minister to his needs. Through Asyriel, this version of Aspiel is allied with the south.
SOURCE:
The Dictionary of Demons written by Michelle Belanger