Ok the question is which dynasties must survive for Rhomania to remain stronger and be able to survive at least into the 19th century as an empire. My thoughts are if the Macedonians survive long enough and then power somehow goes to the Komnenos dynasty that would at least prevent the iconoclasm heresy. Another thought is for the Komnenos dynasty to stop the Angelos dynasty from taking the throne with stronger heirs. These are just my thoughts but I'd like to here from the experts.