Duchy of Saxe-Meiningen
The extinction of the oldest line, Saxe-Gotha-Altenburg in 1825 again led to inheritance disputes among the other lines of the Ernestine family. On 12 November 1826 the decision, from the arbitration of the supreme head of the family, King Frederick Augustus I of Saxony, resulted in the extensive rearrangement of the Ernestine duchies. Saxe-Hildburghausen lost the Districts of Königsberg and Sonnefeld to the new Duchy of Saxe-Coburg and Gotha and the rest of its territories to the Duchy of Saxe-Meiningen. But the last Duke of Saxe-Hildburghausen, Frederick, became the new Duke of Saxe-Altenburg.