Frederick IV of Hohenstaufen (1145 - 1167) was duke of Swabia, succeeding his cousin, Frederick Barbarossa, Holy Roman Emperor, in 1152. He was the son of Conrad III of Germany and his second wife Gertrude von Sulzbach and thus the direct heir of the crown, had there been true heredity. However, on his death bed, Conrad III allegedly advised the only two persons present, his nephew Frederick Barbarossa and the bishop of Bamberg, … Wikipedia
The definitive Wikipedia entry for Frederick IV, Duke of Swabia. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Frederick_IV,_Duke_of_Swabia
The definitive Wikipedia entry for Frederick IV, Duke of Swabia. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Frederick_IV%2c_Duke_of_Swabia