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Jaqon was a devil who lived on Avernus, the first hell of Baator, where he was exiled by Asmodeus for a great betrayal. Asmodeus changed Jaqon's name to Dagon, so that if someone tried to summon him, they would instead summon the powerful demon lord's aspect.
Jaqon led his followers in a battle against Asmodeus, becoming an archdevil in the process.
In order to disrespect Asmodeus and his name, Jaqon behaved in a goodly manor unheard of among devils.