Gargauth

Gargauth (pronounced: GAR-gawth), sometimes called Astaroth, was a exiled archdevil and demigod of betrayal and political corruption. Wandering the realms after being cast out of from Hell for reasons unknown, the utterly depraved devil was spread his own brand of corruption and cruelty. Gargauth embodied the inevitable moral decay that followed both the victories won by evil means, and the selfish, greedy, and ambitious entities (both leaders and groups) that achieved them.

His sigil was a ram’s head with a broken horn.