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Rudolf IV was the Duke of Austria from 1358 to 1365. He was known for his energetic and ambitious rule. During his reign, Rudolf IV initiated significant projects, including the rebuilding of St. Stephen's Cathedral in the Gothic style and the founding of the University of Vienna in 1365. He also attempted to elevate Austria's status by forging the Privilegium Majus, which claimed extensive privileges and the title of archduke for Austria and its dynasty. This act led to a dispute with Holy Roman Emperor Charles IV. Rudolf IV also managed to acquire the Tirol for the house of Austria.

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