Actually a whole eastern total war would be very good. From the Chinese Dynasties of Roman times to the Japanese Samurai warlords of middle ages. But the huge gap in time would mean a campaign would be virtually impossible to finish. Imagine a 4-turn a year campaign that takes 1000+ years to finish? Gyah.

Perhaps allowing a player to chose a time period (such as in MTW) could be a solution to such a problem.