Whats an AoR?

Not fussed about historical accuracy, it all changes from turn 1 anyway. In fact, i'd much rather that history adapted itself for the current game by gaining the technology of conquered nations (e.g. Rome's Aqueducts) and adapting the unit roster depending on progress/situation (Byz units becoming stale in M:TW becuase they did in history, even though Byzantium might hold most of Europe / developing a new unit to counter one that an enemy uses)

I go for mods with new settings mostly (new ages, eras, fantasy mods etc), new factions and units arent really enough to get me to download a mod unless its major (like M:TW XL)