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of Heunburg) to continue the line.
* King Ottokar II of Bohemia (1233-78), since 1252 husband of the (childless) Margaret of Babenberg, dowager Queen of the Romans and the only surviving sister of Duke Frederick. By proximity of blood, she was the closest surviving relative of the last duke. Ottokar and Margaret were proclaimed Duke and Duchess of Austria. However, Margaret was barren and they got divorced

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