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Leopold III Frederick Franz, Duke of Anhalt-Dessau (10 August 1740 – 9 August 1817), known as "Prince Franz" or "Father Franz", was a German prince of the House of Ascania. From 1751 until 1807 he was reigning prince of the Principality of Anhalt-Dessau and from 1807 the first Duke of the Duchy of Anhalt-Dessau.