Leopold I, 1676–1747, prince of Anhalt-Dessau (1693–1747). He served as field marshal in the Prussian army and was nicknamed "the Old Dessauer." As chief military adviser to King Frederick William I of Prussia, he reorganized the Prussian infantry, making it the best in Europe. A stern disciplinarian, Leopold was an able commander. He also helped introduce administrative reform in Prussia. In the War of the Austrian Succession (1740–48) his victory at Kesseldorf (1745) helped bring about the Treaty of Dresden between Prussia and Austria.
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