article: Saxe-Gotha-Altenburg
links: Saxe-Altenburg 1804 Holy Roman Empire 1920 1640 Ernestine duchies 1672 Confederation of the Rhine Saxe-Coburg-Saalfeld 1825 1732 Saxe-Hildburghausen 1680 1691 Gotha First World War 1772 German Confederation 1826 Frederick II, Duke of Saxe-Gotha-Altenburg 1675 Saxe-Gotha Germany 1822 Thuringia Altenburg Personal union