Need a historian...

I need a historian for my submod, I am planning to edit my submod in detail.
But I have no idea which factions used satrapies. and the capitals of their satrapies, otherwise my submod will be unhistoric...

My planned factions that will have satrapies:
Arche Seleukeia : already in EB - I am planning more satrapies for them.
Pahlava: done in my first version - again some more satrapies will be added.
Pontus: need volunteers to give me info...
Baktria: need volunteers to give me info...
Hayasdan: need volunteers to give me info...

ptolemaioi: no idea if they used satrapal system or not...