Peter Friedrich Wilhelm, Duke of Oldenburg, (3 January 1754, Eutin Castle, Eutin – 2 July 1823, Schloss Plön, Plön.) Wilhelm succeeded his father, Frederick Augustus I, Duke of Oldenburg as the Duke of Oldenburg in 1785. Wilhelm's mother was Princess Ulrike Friederike Wilhelmine of Hesse-Kassel.The title became a Grand Duke in 1815, but Wilhelm never used the elevated style. It was not used until 1829 by the son of Wilhelm's cousin and successor, Peter I.
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