Zariel

Zariel is an archdevil of the Nine Hells, formerly Lord of the First.

Background
Once favored by Asmodeus, Zariel sided against him in the Reckoning of Hell. She was overthrown when Bel, the leader of her military forces, turned against her and sided with Asmodeus. Bel was installed as Lord of the First in her stead.

Zariel's current whereabouts are unknown, although most rumors indicate that she is currently imprisoned in The Bronze Citadel where he is siphoning her power, adding it to his own while reducing her to a Soul Shell. What followers she retains, if any, are unknown.