Duke in Bavaria

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Duke in Bavaria (German: Herzog in Bayern) was a title used among others since 1506, when primogeniture was established^{[citation needed]}, by all members of the House of Wittelsbach, with the exception of the Duke of Bavaria which began to be a unique position. So reads for instance the full title of the late 16th century's Charles I, Count Palatine of Zweibrücken-Birkenfeld and patriarch of the House of Palatinate-Birkenfeld: "Count Palatine by Rhine, Duke in Bavaria, Count to Veldenz and Sponheim". The title grew in importance as Wilhelm, Count Palatine of Zweibrücken-Birkenfeld-Gelnhausen began to use it, in the early 19th century, as his primary title – Duke Wilhelm in Bavaria. This choice has also had effect for his descendants.