Well, here's a little preview of some strat_map models. We decided to use 4 levels for common settlement, plus the "huge city" level for our unique cities (Rome, Constantinople, Antiochia etc).
Byzantine settlements
Spoiler Alert, click show to read:
Steppe cultures settlements (Avars, Khazars)
Spoiler Alert, click show to read:
Last but not least, I've lightly changed some aspects of Konstantinoupoli, so here's the final model (I suppose xD)
Spoiler Alert, click show to read: