This map requires at least a 13th century POD to work with a few things merged here and there and others balkanized:
-balkanized Spain > Leon/Galicia, Castile, Granada, Basque/Navarra, Aragon, Catalonia
-balkanized France > France proper, Brittany, Occitania, Arles, Lorrain/Franche-Comte
-Belgium gets Artois and Luxemburg, Netherlands gets East Frisia
-balkanized Germany: Julich-Cleves-Berg, Lower Saxony/ Hannover, Brandenburg-Pomerania, Saxony, Franconia-Hesse, Swabia-Bavaria
-balkanized Italy: Piedmont-Genoa, Tuscany, Lombardy, Venice, Romagna, Rome, Two Sicilies, and Corsica-Sardinia
-Slovenia gets Carinthia, Dalmatia exists (I blame Iluvitar and
Dalmatia Ascendant), Albania loses north Epirus but gains Kosovo, and the other Balkan states have some border changes
-whoops my byzantophilia is showing~
-Trebizond remains its own state, as does Cilicia, Crimea, and Circassia
-independent Assyria and Kurdistan, united Armenia
-united Ireland, Wales-Cornwall, independent Scotland... and an independent Lordship of the Isles
-Danish Scania, Norwegian Jamtland, but Sapmi, Finland, and Karelia exist in this giant northern block together
-Novgorod stands proud against Muscovy, while Ruthenia-Ukraine sits below Belarus
-Poland has the Danzig Corridor but Prussia is its own state(a Baltic/German state most likely); Silesia is independent and also holds Lusatia
-weird Maghrebi borders: one is the Moroccan Arab state, the two others are 2 berber states; West Algeria is Algeria, east is Kabylia