Saxe-Weimar-Eisenach was a German state, created as a duchy in 1809 by the merger of the Ernestine duchies of Saxe-Weimar and Saxe-Eisenach, which had been in personal union since 1741. It was raised to a grand duchy in 1815 by resolution of the Congress of Vienna. In 1903, it officially changed its name to the Grand Duchy of Saxony, but this name was rarely used. The grand duchy came to an end in the German Revolution of 1918–19 with the other monarchies of the German Empire. It was succeeded by the Free State of Saxe-Weimar-Eisenach, which was merged into the new Free State of Thuringia two years later.

Saxe-Coburg and Gotha, or Saxe-Coburg-Gotha, was an Ernestine duchy in Thuringia ruled by a branch of the House of Wettin, consisting of territories in the present-day states of Thuringia and Bavaria in Germany. It lasted from 1826 to 1918. In November 1918, Charles Edward, Duke of Saxe-Coburg and Gotha, was forced to abdicate. In 1920, the northern part of the duchy was merged with six other Thuringian free states to form the Free State of Thuringia: Saxe-Weimar-Eisenach, Saxe-Altenburg and Saxe-Meiningen, Schwarzburg-Rudolstadt and Schwarzburg-Sondershausen, as well as the People's State of Reuss. The southern part of the duchy, as southernmost of the Thuringian states, was the only one which, after a referendum, became part of the Free State of Bavaria.