 Prince 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.From 1560 until 1725 Hardenburg Castle was the main seat of the branch.