Friedrich Ferdinand, Duke of Schleswig-Holstein
Friedrich Ferdinand, Duke of Schleswig-Holstein-Sonderburg-Glücksburg, then Friedrich Ferdinand, Duke of Schleswig-Holstein, was the fourth Duke of Schleswig-Holstein-Sonderburg-Glücksburg and became the fifth Duke of Schleswig-Holstein in 1931. Wikipedia
Born: October 12, 1855, Kiel, Germany
Died: January 21, 1934 (age 78 years), Przemków, Poland
Great grandchildren: Carl XVI Gustaf, Count Ingolf of Rosenborg, Count Christian of Rosenborg, and more