Friedrich Karl von Hessen, a German prince elected by the Parliament of Finland to become King Väinö I, renounces the Finnish throne.

Frederick Charles Louis Constantine, Prince and Landgrave of Hesse (German: Friedrich Karl Ludwig Konstantin Prinz und Landgraf von Hessen-Kassel; Finnish: Fredrik Kaarle; 1 May 1868 – 28 May 1940), 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. During this brief period, he was known in Finnish as Fredrik Kaarle.