They are Chieftain, Warlord, Prince, King, Emperor, and Deity. I think this is how they go but I am guessing by observation:
Chieftain: 0-100 posts
Warlord: 100-300 posts
Prince: 300-500 posts
King: 500-800 posts
Emperor: 800-1200 posts
Deity: 1200+ posts
I only think this is how it goes.
------------------------------------------LORD OF THE RODS-------------------------------------------
Three Rods for the SMAC Mods under alien sky, Seven for the Civ2 Mods in their halls of old,
Nine for the Civ3 Mods doomed to cry, One for the the Dark Lord on his dark throne
In the Land of Civfanatics where the Shadows lie.
One Rod to rule them all, One Rod to find them, One Rod to ban them all and in the darkness bind them
In the Land of Civfanatics where the Shadows lie.