The Demonic Hierarchy is the name of the Nine Lords of Arathrum. It is broken up into three groups of three. One group for each of the three domains of demons with an Archdaemon leading each.
Affliction
The ruler of Affliction is Archdaemon Belial. He is accompanied by the two of three tripplets Mammon and Morpheus, with the last of the three, Morax, serving as the temporary ruler of destruction after the civil war. (Formally wife and son Mara and Belphegor.) NOTE: Mammon, Morpheus, and Morax were created from Mara's corpse by Belphegor out of saddness.
Creation
Archdaemon Belial
Mara
Belphegor
Mara and Belphegor killed by Apollyon
Archdaemon Belial
Mammon
Morpheus
Belial is killed by The Man, Lilith replaces him with a puppet.
Rangda (posing as Belial)
Mammon
Morpheus
Corruption
The ruler of Corruption is Archdaemon Lilith (Formally Archdaemon Beelzebub). She is accompanied by her son Caemon the Deceiver and half-affliction child Baal. (Formally daughter Loralie.)
Creation
Archdaemon Beelzebub
Lilith
Caemon
Beelzebub is killed by Apollyon
Archdaemon Lilith
Caemon the Deciever
Loralie
Loralie is cast out for disobedience, Lilith and Belial's son Baal is raised.
Archdaemon Lilith
Caemon the Deceiver
Baal
Destruction
Destructuion is ruled by three beings, with none having more power. After the civil war the thrones were given to Morax of Affliction, Murmur, Liliths advisor, and Samael, a general of Appollyon who betrayed the armies of destruction for power. Tricked by Caemon, gaing him his title.
Apollyon the God of Destruction, Bane of Life, and Ruler of Arathrum
Azaezel
Azrael
Apollyon dethroned and the twins each divided into six Juggernauts. Destruction divided
Morax
Murmur
Samael