Nikolaus, Hereditary Grand Duke of Oldenburg German duke (1897-1970) (1897–1970) Parents Duchess Elisabeth Alexandrine of Mecklenburg-Schwerin Frederick Augustus II, Grand Duke of Oldenburg Children Duke Peter of Oldenburg Anton-Günther, Duke of Oldenburg Duchess Rixa of Oldenburg Huno Herzog von Oldenburg Duchess Eilika of Oldenburg Duchess Altburg of Oldenburg Duke Johann of Oldenburg Duke Egilmar of Oldenburg Duke Friedrich August of Oldenburg Siblings Alexandrine von Holstein-Gottorp Duchess Margarete of Oldenburg Ingeborg Alix von Oldenburg Duke Friedrich August of Oldenburg Duchess Altburg of Oldenburg Duchess Sophia Charlotte of Oldenburg Partners Anne-Marie von Schutzbar genannt Milchling Princess Helene of Waldeck and Pyrmont
