Two factors, and two alone, explain the Eastern Roman Empire's extraordinary resilience: first, authorities made an extraordinary effort to persuade subjects they were ruling on their behalf — and then actually did so. Second, the empire had a tightly unified Roman and Orthodox identity that made every alternative — rule by non-Romans or non-Christians — worse. No separatist movements, no peasant uprisings, no warlords carving out territory. Just subjects who preferred to stay.