Duchy of Saxe-Coburg and Gotha
Carl Eduard reigned until 18 November 1918 when the Workers' and Soldiers' Council of Gotha deposed him during the German Revolution. The two Duchies became separate states, but soon joined with bigger states. Saxe-Coburg became a part of Bavaria, and Saxe-Gotha merged with other small states to form the new state of Thuringia in 1920 in the Weimar Republic.