Duchy of Saxe-Gotha
When the house of Saxe-Gotha and Altenburg became extinct in 1825, Saxe-Gotha-Altenburg was split. Saxe-Gotha passed to the Duke of Saxe-Coburg-Saalfeld who in turn gave Saalfeld to Saxe-Meiningen. The Duke of Saxe-Hildburghausen became Duke of Saxe-Altenburg, and gave Saxe-Hildburghausen to Saxe-Meiningen.