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| | Reference.com/Encyclopedia/Archduke |
 | | The title Archduke of Austria, the only one to become generally notable, was invented in the Privilegium Maius, a 14th century forgery initiated by Duke Rudolf IV of Austria. |
 | | Ladislaus the Posthumous, Duke of Austria, who died in 1457, was never in his lifetime authorized to use it, and accordingly, not he nor anyone in his branch of the dynasty, ever used the title. |
 | | From the 16th century onward, archduke or its female form, archduchess, came to be used by all the members of the House of Habsburg, similar to the title Prince in many other royal houses. |
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