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Of or pertaining to an archduke or archduchy.

On assuming the government of Styria he set to work to extirpate Protestantism, which had made considerable progress in the Austrian archduchies.

Hungary, Bohemia, Galicia, Illyria and Dalmatia; one archduchy, Austria; one principality, Transylvania; one duchy, Styria; one margraviate, Moravia, and one county, Tyrol.

In 1453 the Emperor Frederick III, a member of this House, had conferred upon the country the rank of an archduchy before he himself became ruler of all Austria.

Austria, which had been solemnly created an archduchy by the emperor Frederick in 1453, was claimed by the three remaining Habsburg princes, and lower Austria was secured by Frederick, while Albert obtained upper Austria.