Frederick Charles Louis Constantine, Prince and Landgrave of Hesse, was the brother-in-law of the German Emperor, Wilhelm II. He was elected King of Finland on 9 October 1918, but renounced the throne on 14 December 1918. Wikipedia
Born: May 1, 1868, Plön District, Germany
Died: May 28, 1940 (age 72 years), Kassel, Germany
Children: Prince Wolfgang of Hesse, Prince Christoph of Hesse, Philipp, Landgrave of Hesse, and more
Great grandchildren: Donatus, Landgrave of Hesse, Mafalda von Hessen, Princess Maria Tatiana of Yugoslavia, and more
Grandchildren: Moritz, Landgrave of Hesse, Prince Heinrich of Hesse-Kassel, Prince Rainer of Hesse, and more
Grandparents: Prince William of Hesse-Kassel, Prince Charles of Prussia, Princess Charlotte of Denmark, and more