Belial

Belial is a fictional demon appearing in Preludes and Nocturnes and Season of Mists.

History
Belial is one of Lucifer Morningstar's co-rulers of Hell; part of the triumvirate formed with Lucifer and Beelzebub and Azazel after a civil war in Hell destabilized the realm as was seen in A Hope in Hell.

It is based on a figure from Judaeo-Christian myth; Belial, also referred to as Beliar, a demon. The name means "worthless" in Hebrew, and later came to represent the personification of the devil.

Belial was an Archduke of Hell, it replaced Azazel on the Triumvirate.