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The remarkable thing about the Bornu Empire (or Kanem-Bornu) is that it lasted for five hundred years (and was founded as a kingdom long before that, around the time of the Viking invasions of England). Quite impressive continuity. In fact a remnant of a remnant still exists as a traditional monarchy within Nigeria: https://en.wikipedia.org/wiki/Borno_EmirateThe worst thing about it is that the Borno Empire might as well be Space-Filling-Empire #256 for all I know about them.