Had four at one point, but didn't last. Two emperors was originally a Emperor-protege thing, but grew independent under the same name on the basis that Rome and Constantinople was just that far apart. Then one of then just made it official and there was no way around it unless they wanted to selfdestruct. If they had no strong neighbours it'd probably have gone to a full civil war.Not that you aren't onto something, but...
If they weren't emperors, then who WAS? Who rules an empire, if not an emperor?
I know Rome had a two-man or three-man arrangement at one time or another, but...
The issue was the Empire was too large, and geographically too distant from the capital. Any provincial governor could scrape up enough funds for their own army, and the legions are loyal to individuals than the state.
By the end they were putting down a rebellion Somewhere at any given time, and ignored others as long as the taxes kept coming.
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