Because the Balkans are already overflowing and nothing that came out of the Balkans was ever interesting anyway. Brittany spoke Breton or Gallo, depending on the era, so no. And the Normans only spoke French if you define every langue d'oïl as "French." Norman is generally regarded as a separate family of languages under langues d'oïl. Oh, I don't really expect any of these to be added, but if Alexander the Obnoxious can get his own civ, I don't see why Alfred the Great can't.