article: Saxe-Altenburg
links: Holy Roman Empire Weimar Republic Saxe-Coburg-Gotha Saxe-Gotha-Altenburg 1834 Ernestine duchies 1672 Saxe-Meiningen Saxe-Coburg-Saalfeld Saxe-Hildburghausen 1918 North German Confederation 1613 Free State German Confederation Wettin (dynasty) States of the Weimar Republic German Empire Saxe-Weimar-Eisenach Saxe-Gotha Thuringia Altenburg Saxe-Weimar Personal union