Medieval II: Total War Game Info - Battle System

Confirmed factions found on the Total War official website include

* The English
* The Papacy
* The Holy Roman Empire
* The Egyptians (Presumably the Fatimid dynasty (Early Period), Ayyubid dynasty (High Period) and finally the Mamluks (Late Period))
* The Byzantine Empire
* The French
* The Moors also known as Almohads
* The Scots
* The Danes
* The Venetians

The list has not been finalised yet, but the following factions are also expected at this stage to be included:

* The Spanish
* The Portuguese
* The Milanese
* The Sicilians
* The Poles
* The Russians
* The Hungarians
* The Seljuk Turks, Ottoman Turks
* The Mongols
* The Timurids

Also with New World factions such as:

* The Aztecs
* The Mayans

Note - see the Komnenian army for more information on the Byzantine army of the crusading period.