Leopold III, Duke of Austria, (1351–1386), Duke of Styria, Carinthia, Tyrol, and Vorderösterreich of House of Habsburg, died in Battle of Sempach
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Leopold III, Margrave of Austria, the Saint (1050–1136), Margrave of Austria from the house of Babenberg
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Marquard received a state with numerous rebellions, such as those of Gualtiero Bertoldo IV of Spilimbergo and of the lords of Duino, and in war with Albert III and Leopold III of Austria.
William married Judith or Ita von Babenberg, daughter of Leopold III of Austria and Agnes of Germany, sometime before March 28, 1133.