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(allegedly named after his favourite oath, "Yes, so [help] me God!") was made Count Palatine of the Rhine in 1140, and became Margrave of Austria on Leopold's death in 1141. Having married Gertrude, the widow of Henry the Proud, he was invested in 1143 with the Duchy of Bavaria, and resigned his office as count palatine. In 1147 he participated in the Second Crusade, and after his return, renounced Bavaria at the instance of the new king Frederick Barbarossa

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