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In page House of Habsburg:

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Latin was the administrative language of the Empire until the aggressive promotion of German by Joseph II in the late 18th century, which was partly reversed by his successors. From the 16th century most if not all Habsburgs spoke French as well as German and many also spoke Italian.[citation needed] Ferdinand I, Maximilian II and Rudolf II addressed the Bohemian Diet in Czech, even though it is not clear that they were fluent. By contrast there is little evidence that later Habsburgs in the 17th and 18th centuries spoke Czech, with the probable exception of Ferdinand III, who had several stays in Bohemia and appears to have spoken Czech while there. In the 19th century Francis I had some Czech and Ferdinand I spoke it decently.[7]