Jaqon

Jaqon is an exiled devil who lives on Avernus, the first hell of baator. Asmodeus exiled Jaqon for a great betrayal. He changed Jaqon's name to Dagon to so that if someone tried to summon him, instead they would summon the powerful demon lord's aspect.

Jaqon led his followers in a battle against Asmodeus to become an archdevil.

Jaqon is chaotic good to disrespect Asmodeus' name.