Will there be emergent factions (e.g. like in Total War games) in the various Eras? Obvious examples that have been pointed out on the forums so far are:

- Bronze Age = Sea Peoples, Cimmerians 

- Classical Age = Huns, Goths, Slavs

- Medieval Age = Mongols

- Renaissance = Timurids

In later eras, perhaps "revolutionary/reformation" factions can emerge e.g. Protestant reformation or like a French revolution event