When the First World War ended in 1918 and the Weimar Republic was founded, the Duchy of Saxe-Coburg-Gotha ceased to be a duchy. At first, it formed the Free State of Coburg.
Upon the conclusion of World War I in 1918 and the creation of the Weimar Republic, the Duchy of Saxe-Coburg-Gotha transformed into a non-hereditary state. It initially took the form of the Free State of Coburg.