German duke (1784-1812)
Duke Peter Frederick George of Oldenburg was a younger son of Peter I, Grand Duke of Oldenburg and his wife Duchess Frederica of Württemberg. He was a son-in-law of Paul I of Russia through marriage to his daughter Grand Duchess Catherine Pavlovna of Russia. He was referred to as a prince in Russia, Prince Georgy Petrovich Oldenburgsky.
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