 Frederick August I, Duke of Oldenburg

Friedrich August, Duke of Holstein-Oldenburg (20 September 1711 in Gottorp, Schleswig – 6 July 1785 in Oldenburg) was the son of Christian August, regent of Holstein-Gottorp and his wife Margravine Albertine Friederike of Baden-Durlach.Frederick Augustus married on 21 November 1752 to Princess Ulrike Friederike Wilhelmine of Hesse-Kassel; the couple had three children