Guillermo Augusto de Sajonia-Eisenach, Ernest August, Hereditary Prince of Saxe-Eisenach, Karl August, Hereditary Prince of Saxe-Eisenach, Frederick William, Hereditary Prince of Saxe-Eisenach, Prince Ernest August of Saxe-Gotha-Altenburg, Adolf William, Hereditary Prince of Saxe-Eisenach