 At the February 1079 synod of Lent, Henry's opponents, Bishops Altmann of Passau and Herman of Metz, convinced the Pope to send new legates to Germany, but the Pope forbade his legates to pass judgement against the prelates who had been appointed by Henry.Henry confiscated Rudolf of Rheinfelden's inherited Swabian estates and ceded them to Bishop Burchard of Lausanne in March.In the same month, he made a wealthy local aristocrat, Frederick of Büren, duke of Swabia.