Christian August, Prince of Anhalt Zerbst
Christian August, Prince of AnhaltZerbst was a German prince of the House of Ascania. He was a ruler of the Principality of AnhaltDornburg, then, from 1742, a ruler of the entire Principality of AnhaltZerbst. He was also a Prussian Generalfeldmarschall, but is best known for being the father of Catherine the Great of Russia.
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Source: Wikipedia