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.
John IV, Duke of Krnov John IV, Duke of Krnov (also known as "John IV of Opava-Racibórz" or "John the Elder"; ; German: "Johann IV. von Jägerndorf" or "Johann III. von Troppau-Ratibor" ;  1440 – 1483 in Wodzisław Śląski) was a member of the Opavian branch of the Bohemian Přemyslid dynasty. He was Duke of Krnov from 1452 to 1474 and Duke of Wodzisław Śląski from 1464 until his death.