Christian (Catholic):
Comune di Pisa (Italians, Italian City States)
Regnum Castiliæ (Leon-Castile)
Ducatus Bohemiæ (Bohemia)
Regnum Ungariæ (Hungaria)
Regnum Franciæ (Franks)
Sacrum Imperium Romanum (East-Franks, Germans)
Regnum Angliæ (Norman-England)
Regnum Siciliæ (Siculo-Normans)
Magnus Ducatus Poloniæ (Poland)
Regnum Daniæ (Denmark)
Corona Aragonæ (Aragon, Barcelona)
Christian (Orthodox/other):
Basileia ton Rhomaion (Roman Empire)
Kievskaya Velikiy kniazhestvo (Rus)
Principatus Armeniæ de Cilicia (Armenians)
Muslim (Shiits+Sunnits):
al-Murabitun (Andalusia, Moors)
al-Fatimiyyun (Fatimid Egypt)
al-Salajiqa (Grand Seljuk Empire, Turks)
al-Salājiqa al-Rûm (Rum Seljuks, Turks)
al-Ziri (Berbers)
Pagan:
Desht-i Qipchaq (Cumans, Kipchaqs)
plus tons of historical independent factions (non-playable).