Frederick IV of Zollern
Frederick IV of Zollern (c. 1188–c. 1255), also numbered Frederick II as Burgrave of Nuremberg, was a son of Frederick I of Nuremberg and the younger brother of Conrad I. After his father's death around 1204 he succeeded as Burgrave of Nuremberg.
In 1218 the brothers divided their inheritance: Conrad took the Franconian lands and the Nuremberg burgraviate, while Frederick received the ancestral County of Zollern in Swabia and founded the Swabian line of the Hohenzollern. His son Frederick V succeeded him.