North Sea: England, Scotland, Ireland, Denmark, Sweden, Norway
(Norway starts landless. Ireland is in even if not independent for variety sake)
Hispania and North Africa: Aragon, Castille, Navarre, Portugal, Almohad, Marinid, Hafsid
Italia: Sicily, Venice, Genoa, Pisa, Milan, Bologna, Papal States
Red Sea and Arabia: Ayyubids, Makuria, Zagwe, Oman, Uyyunids, Rasulids
(The Uyyunid and Rasulid were added simply because there's two open slots)
France and Lowlands: France, Burgundy, Toulouse, Flanders, Brabant, Friesland
Germania: HRE, Swiss, Bavaria, Austria, Bohemia, Lorraine, Trier
Balkans: Hungary, Croatia, Bulgaria, Serbia, Latin Empire, Epirus, Wallachia
(Croatia was under personal union with Hungary acting as vassal, Wallachia position in the selection is rather tenuous; so changes is possible)
Levant and Anatolia: Rum, Jerusalem, Antioch, Cilician Armenia, Niceaea, Trebizond
Steppes: Ilkhanate, Golden Horde, Cumans, Volga Bulgar, Alans
(one slot open)
Baltic and East Europe: Poland, Kievan Rus, Lithuania, Teutonic Order, Yotvingians, Ryazan-Murom
(There should be a representative of Prussians for now its Yotvingians; There's an open Rus faction slot, either Galicia Volhynia, Chernigov, or Ryazan-Murom - for now we place Ryazan-Murom)
Caucasia, Mesopotamia, and Persia: Georgia, Zengid, Abbasid, Khwarezm, Ghurid, Azerbaijan
(there's one slot open, for now we arbitrarily take Azerbaijan)