I'll have a go at this again (again, all of these wouldn't be in the same TL)
* Byzantine Empire (modern form OTL Greece, Macedonia, southern Bulgaria, Thrace and Western Anatolia). Other successor states would include:
Europe:
Bulgaria
Serbia
Orthodox Albania, Bosnia and Croatia
Asia:
Armenian Cilicia
Cyprus
Orthodox Turkish/Kurdish Central Anatolia
Greek Republic of Pontus
Armenia
Other nations:
* Longer-lasting Seleucid and Lysimachean Empires
* Independent Christian Syria (including Antioch) and Egypt
* Independent Burgundy and Brittany
* Kingdoms of Wallachia and Alania, based on CK2 borders
* Longer-lasting Norman Kingdom of Sicily, including territories in Tunisia and Libya
* Spain split up into Catalonia (capital at Barcelona), Navarre and Andalusia (capital at either Corduba or Seville)
* Italy split up into Northern Italy (capital at Rome), Southern Italy (capital at Naples or Capua), Sicily (including Malta) and Sardinia-Corsica
* Nestorian Christian Ilkhanate or Chagatai Khanate