At the time of the defeat of Napoleon in 1814, Talleyrand acted for the restoration of Louis XVIII and the establishment of a constitutional monarchy. As Foreign Minister, he negotiated the terms of the Treaty of Paris. As compensation for his work, he received the title of Prince Talleyrand and a seat in the Chamber of Peers.
In 1815, the title was made hereditary, then attributed in 1817 to his nephew Edmond; the letters patent of the title were published in 1818, with a promise of establishment of majorat effective in 1821.[1]
List of Dukes
1st Duke (1814-1838): Charles-Maurice de Talleyrand-Périgord (1754-1838) and Prince Talleyrand. His younger brother Archambaud de Talleyrand-Périgord (1762-1838) obtained the title Duke of Talleyrand by courtesy during the life of his brother.
2nd Duke (1838-1872): Alexander Edmond de Talleyrand-Périgord (1787-1872), nephew of Prince Talleyrand and son of Archambaud de Talleyrand. Also known as Duke of Dino.
6th Duke (1937-1952): Paul Louis Marie Archambault Boson de Talleyrand Périgord (1867-1952), brother of Hélie de Talleyrand. Known as the Duke of Valençay.
7th Duke (1952-1968): Hélie de Talleyrand-Périgord (1882-1968), cousin of Boson de Talleyrand, first known as "Marquis de Talleyrand ".