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What empires do you know of that, like the Eastern Roman Empire, withdrew from their former core territory and reestablished themselves in a new area?

Some examples:
  • The Umayyad Caliphate fell in the Middle East, but established the Emirate of Cordoba, and later the Caliphate of Cordoba.
  • The Seljuk Empire disintegrated in the east, but the Seljuk Sultanate of Rum survived in Anatolia
  • The Golden Horde survived beyond the collapse of the Yuan Dynasty
  • The Timurids re-established themselves in India as the Mughal Empire
What alternate empires could have done the same thing and retreated to their own "Byzantium"?
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