Peter I of Oldenburg Prince-Bishop and Grand Duke (first as regent, then officially after 1823) of Oldenburg (1755-1829) (1755–1829) Parents Sophia Charlotte of Schleswig-Holstein-Sonderburg-Beck Prince Georg Ludwig of Holstein-Gottorp Children son1 von Holstein-Gottorp Augustus, Grand Duke of Oldenburg Duke George of Oldenburg Siblings Friedrich von Holstein-Gottorp Prince Wilhelm August of Holstein-Gottorp Friedrich Alexander zu Dohna-Schlobitten Sophie Charlotte Gräfin zu Dohna-Schlobitten Partners Duchess Frederica of Württemberg