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In 1355, Serbian emperor Stefan Dušan began a war against the late-era Byzantine Empire, seizing Adrianople and preparing his massive army to march on nearby Constantinople. However, he died of an unexpected illness, his planned conquests were aborted, and his empire started fragmenting not long after his death. More info can be found here: https://en.m.wikipedia.org/wiki/Serbian_Empire

And, for reference, here's what the Serbian Empire looked like at its height:

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So, let's say we delay Dušan's death for at least a few years, just long enough to capture Constantinople and perhaps consolidate some of his gains. What happens next, for the Serbians, Greeks, and all involved parties? Particularly, how would this enlarged Serbian Empire (which would surely be very insistent on referring to itself as the legitimate current iteration of the Roman Empire) hold up against the Ottomans?
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