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Peter I or Peter Frederick Louis of Holstein-Gottorp (German: Peter Friedrich Ludwig von Holstein-Gottorp) (17 January 1755 – 21 May 1829) was the Regent of the Duchy of Oldenburg for his incapacitated cousin William I from 1785 to 1823, and then served himself as Duke from 1823 to 1829.
Following the death of Wilhelm in 1823, he himself became reigning Duke of Oldenburg. Although the Duchy of Oldenburg had been elevated to a Grand Duchy in 1815, he refrained from using the title of Grand Duke. His son, Augustus, was the first Duke of Oldenburg to use the style of Grand Duke.[3]
He was succeeded as Grand Duke of Oldenburg by his eldest son, Paul Friedrich August, the first of the House of Holstein-Gottorp to use the elevated style.
^"Oldenburg Royal Family". Archived from the original on 17 March 2006. Retrieved 17 June 2014.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
^"Oldenburg Royal Family". Archived from the original on 17 March 2006. Retrieved 17 June 2014.{{cite web}}: CS1 maint: bot: original URL status unknown (link)