What was the man that preceded Frederick IV of Hohenstaufen also known as in another language?
Frederick IV, Duke of Swabia Frederick IV of Hohenstaufen (1145–1167) was duke of Swabia, succeeding his cousin, Frederick Barbarossa, Holy Roman Emperor, in 1152.
Robert IV, Count of Nassau Robert IV of Nassau (German: "Ruprecht") (died ca. 1240) was an early member of the House of Nassau. The House of Nassau would become an important aristocratic family in Germany, from which are descended the present-day rulers of the Netherlands and Luxembourg.