Friedrich Ferdinand, Duke of Schleswig-Holstein-Sonderburg-Glücksburg, then Friedrich Ferdinand, Duke of Schleswig-Holstein (12 October 1855 – 21 January 1934), was the fourth Duke of Schleswig-Holstein-Sonderburg-Glücksburg and became the fifth Duke of Schleswig-Holstein in 1931 and the head of the House of Oldenburg.

Family and succession

Friedrich Ferdinand was born in Kiel, Duchy of Holstein, the eldest son of Friedrich, Duke of Schleswig-Holstein-Sonderburg-Glücksburg and Princess Adelheid of Schaumburg-Lippe and a nephew of Christian IX of Denmark. Friedrich Ferdinand succeeded to the headship of the House of Schleswig-Holstein-Sonderburg-Glücksburg and title duke upon the death of his father on 27 November 1885. When the Head of the House of Schleswig-Holstein-Sonderburg-Augustenburg Albert, Duke of Schleswig-Holstein died on 27 April 1931, Friedrich Ferdinand became the Head of the House of Oldenburg and inherited the title Duke of Schleswig-Holstein.

Marriage and issue

Friedrich Ferdinand married Princess Karoline Mathilde of Schleswig-Holstein-Sonderburg-Augustenburg, daughter of Frederick VIII, Duke of Schleswig-Holstein-Sonderburg-Augustenburg and his wife Princess Adelheid of Hohenlohe-Langenburg (and sister of Augusta Victoria, German Empress), on 19 March 1885 at Primkenau. Friedrich Ferdinand and Karoline Mathilde had six children:

• Princess Viktoria Adelheid Helene Luise Marie Friederike of Schleswig-Holstein-Sonderburg-Glücksburg (31 December 1885 – 3 October 1970)
• Princess Alexandra Viktoria Auguste Leopoldine Charlotte Amalie Wilhelmine of Schleswig-Holstein-Sonderburg-Glücksburg (21 April 1887 – 15 April 1957)
• Princess Helene Adelheid Viktoria Marie of Schleswig-Holstein-Sonderburg-Glücksburg (1 June 1888 – 30 June 1962)
• Princess Adelheid Luise of Schleswig-Holstein-Sonderburg-Glücksburg (19 October 1889 – 11 June 1964)
• Wilhelm Friedrich Christian Günther Albert Adolf Georg, Duke of Schleswig-Holstein (23 August 1891 – 10 February 1965)
• Princess Karoline Mathilde of Schleswig-Holstein-Sonderburg-Glücksburg (11 May 1894 – 28 January 1972)

Death

Friedrich Ferdinand died in 1934 at Hause Eckernförde close to Güby in Schleswig-Holstein, Germany, aged 78.