Duke Pius August in Bavaria

Duke Pius August in Bavaria, full German name: Pius August Herzog in Bayern was a Duke in Bavaria as a member of the Palatine Birkenfeld-Gelnhausen line of the House of Wittelsbach. He was the paternal grandfather of Empress Elisabeth of Austria through his son Duke Maximilian Joseph in Bavaria, as well as the great-grandfather of Queen Elisabeth of the Belgians and an ancestor of the current generations of the Belgian and Italian Royal Families and the Grand Ducal Family of Luxembourg.