ใครแต่งงานกับNikolaus, Hereditary Grand Duke of Oldenburg?

Nikolaus, Hereditary Grand Duke of Oldenburg (German: Nikolaus Friedrich Wilhelm von Holstein-Gottorp, Erbgroßherzog von Oldenburg; 10 August 1897 – 3 April 1970) was the eldest son of Frederick Augustus II, Grand Duke of Oldenburg, who was the last ruling Grand Duke of Oldenburg. In 1931, Nikolaus succeeded to his father's titles and assumed the role of pretender to the Grand Duchy, until his death in 1970.

Princess Helena of Waldeck and Pyrmont (German: Helene Bathildis Charlotte Maria Friederike Prinzessin zu Waldeck und Pyrmont; 22 December 1899 – 18 February 1948) was the only daughter of Friedrich, Prince of Waldeck and Pyrmont, last reigning Prince of Waldeck and Pyrmont, and wife of Nikolaus, Hereditary Grand Duke of Oldenburg.

Nikolaus, Hereditary Grand Duke of Oldenburg (German: Nikolaus Friedrich Wilhelm von Holstein-Gottorp, Erbgroßherzog von Oldenburg; 10 August 1897 – 3 April 1970) was the eldest son of Frederick Augustus II, Grand Duke of Oldenburg, who was the last ruling Grand Duke of Oldenburg. In 1931, Nikolaus succeeded to his father's titles and assumed the role of pretender to the Grand Duchy, until his death in 1970.