 Henry's Swabian opponents elected the late Berthold of Rheinfelden's brother-in-law, Berthold II of Zähringen, to be their duke and he proclaimed himself the "vassal of St Peter" (that is of the Holy See).Henry had to send his German troops back to Germany to fight in Swabia and Bavaria.He began negotiations with King Ladislaus I of Hungary about an alliance, but Welf I prevented their meeting.