Another rearrangement of the Ernestine lands took place in 1672 after Duke Frederick William III of Saxe-Altenburg, descendant of Duke John Phillip, had died without heirs and his cousin Duke Johann Ernst II of Saxe-Weimar inherited parts of his duchy, which originally had been split off the Saxe-Weimar territory in 1602. Johann Ernst II immediately divided the enlarged Saxe-Weimar lands between himself and his younger brothers John George I and Bernhard II, who received the Duchies of Saxe-Eisenach and Saxe-Jena, which reverted to Saxe-Weimar upon the death of Bernhard's son Duke Johann Wilhelm in 1690.