My Romani challenge:

VH/H (battles in VH are impossible, M sometimes too easy). Conquer historical Roman Empire by 100 BC. VERY tough to get. Also, ROLEPLAY your way through it, don't just declare massive wars and spam monster troops. Finally, succeed in all the conquests that failed or were abandoned. By AD 14, take and keep:

Aethiopia (f--k you Candice!)
Saba
Mesopotamia
Dacia
Upper and Lower Germany (up to the Elbe)
Hibernia
Caledonia
Marcomannia (the one Marcus Aurelius fought over but Commodus never annexed for some reason)
The modern-day Crimea

Not just raids--ADD THESE TO THE EMPIRE. Permanently. By AD 14

That will keep you occupied (at least, the time limit should). Also, vassalize (and keep alive in game) Sweboz, Hayasdan, Parthia, and, for fun, the Seleucids (if you can prevent Parthia from conquering them totally, awesome). Destroy Casse, Lusotann, Carthage, Ptolemies, Aedui, Arverni, Pontus, KH, Macedon, Epiros. Once, however, they're all gone, yeah, the game becomes ultra-easy and you can just spawn enormous armies that just overwhelm all in their path. But what the heck, Roma victa.