Certain comments about title formation:
-The Imperium Romanum shouldn't be confined to Solar-Imperial characters only, as a) there is no reason why a sufficiently powerful character of a different religion in the ERE couldn't or wouldn't claim the title and b) according to the title history, the ERE has had non-SI Emperors. However, claiming the title should require holding Constantinople.
-The Tiudiskaz Reik should be formable by Bajowarijoz (non-Germanic religion) characters.
-The Imperium Romanum shouldn't be confined to Solar-Imperial characters only, as a) there is no reason why a sufficiently powerful character of a different religion in the ERE couldn't or wouldn't claim the title and b) according to the title history, the ERE has had non-SI Emperors. However, claiming the title should require holding Constantinople.
-The Tiudiskaz Reik should be formable by Bajowarijoz (non-Germanic religion) characters.