Natus ob Imperium is a global mod focused on antiquity. In fact it's an independent, unique game based on the MTW2K engine. The game has plenty of unique features such as exclusive graphics (which takes into account the specifics of the warriors and geography) and original gameplay.
"If you find yourself alone, riding in green fields with the sun on your face, do not be troubled! For you are in Elysium and your already dead!"
-Maximus Decimus Meridius, commander of the armies of the North, general of the Felix Legions
Yeah, overused quote but it shall never get old! :D