Jaqon

Jaqon was an exiled devil who lived on Avernus, the first hell of baator. Asmodeus exiled Jaqon for a great betrayal. He changed Jaqon's name to Dagon, 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 was chaotic good to disrespect Asmodeus' name.