Medieval II is incredible, and even more so with the Kingdoms expansion. Can play as the Teutonic Knights, plus theres a Britain Campaign (with the English, the Scots, the Welsh and the Irish), a Crusades Campaign (Kingdom of Jerusalem, Principality of Antioch, Turks, Egyptians, and Byzantines), and Americas (Spanish, several native tribes including the Aztecs and Maya, and the French and English come in later as non-playable factions). Almost limitless gameplay between all the factions, add-ons and options you can take during the course of the campaigns.