Duke of Ayen
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The title Duke of Ayen (duc d'Ayen) was created by King Louis XV on 12 March 1737 raising the former county of Ayen to a Dukedom[1] It was used as a courtesy title by the eldest son of the Duke of Noailles[2] The Duke of Ayen are cousins of the Dukes of Mouchy[3] a cadet branch[4] of the House of Noailles[3]