A large number of imperial castles were built in regions such as Swabia, Franconia, the Palatinate and the Alsace, where there were a high density of imperial estates (Reichsgüter) during the Hohenstaufen era.
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An imperial castle or Reichsburg was a castle built by order of the German or Holy Roman Emperor, whose management was entrusted to Reichsministeriales or Burgmannen.
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From the death of his father in 1357, Frederick bore the title of Burgrave and so was responsible for the protection of the strategically significant imperial castle of Nuremberg.