Still, the Roman Empire lasted till what? 29 May 1453.
That’s a pretty good run. Of course, a citizen of the Republic wouldn’t have recognized it. Rome itself was no longer a part of the Empire. And like our modern world, it was the Muslims who finally cut it off.
1453 was the date Constantinople fell. It was the capital of the Eastern empire. The Western empire, whose capital was Rome, fell in the fifth century.