House of Leiningen
The title of Prince of Leiningen () was created by the Holy Roman Emperor Joseph II, who elevated Carl Friedrich Wilhelm, Count of Leiningen-Dagsburg-Hardenburg (a younger branch of the House of Leiningen) to the rank of "Reichsfürst" (Prince of the Holy Roman Empire) on 3 July 1779. Together with all other titles of nobility in Germany, it was abolished with the 1919 Weimar Constitution.