Concentrating on the late medieval period, Age of Chivalry: Hegemony replaces or significantly alters each of the civilizations in the original game, while adding a number of new ones, allowing the player to control Central and Western European states. Many new units and technologies have been added and gameplay dynamics have been changed considerably in this complete overhaul of Age of Empires II.
The best mod for Age of Empires 2 you can find. I give respect to the guys who keep working on this mod and are still keeping it alive. Had an amazing time trying all the factions and playing around with the new EVERYTHING haha