Duchy of Ayen
The Duchy of Ayen is a French, male-line hereditary duchy ( duché-pairie ), which was established by patent dated March 12, 1737 for Louis de Noailles on the occasion of his wedding.
Since then, the owner has always been the eldest son of the Duke of Noailles.
See also
literature
- Jean Baptiste Pierre Jullien de Courcelles: Histoire généalogique et héraldique des pairs de France , 1827, pages 75-77.