By what nickname was the father of George Frederick of Brandenburg-Ansbach known ? 
George, Margrave of Brandenburg-Ansbach: George of Brandenburg-Ansbach (German: "Georg or Jürgen der Fromme" ) (4 March 1484 – 27 December 1543), known as George the Pious, was a Margrave of Brandenburg-Ansbach from the House of Hohenzollern.
i don't know