Antoine IX Geneviève Héraclius Agénor de Gramont (17 July 1789 – 3 March 1855), 9th Duke of Gramont, Duke of Guiche, Prince of Bidache, etc. was a 19th-century French aristocratic Army general and courtier.
De Gramont was born at Versailles, the only son of Antoine, 8th Duke of Gramont by his wife Aglaé, daughter of Gabrielle de Polastron, duchesse de Polignac, a court favourite of Queen Marie-Antoinette.
When the French Revolution broke out, in the year of his birth, the De Gramont family left France for various parts of Europe: including Britain, Italy, Austria as well as Russia.
Héraclius de Gramont joined his father in Mittau, who was serving with Louis XVIII, before being commissioned at the age of nine in the Tauride Grenadier Regiment. Following basic training he was promoted Lieutenant and fought under the Russian General Suvorov's command.
Accorded the courtesy title of duc de Guiche 1813, he returned to England to complete his education before serving under the Duke of Wellington later in the Peninsular Wars. After the fall of Napoleon, his military career continued to prosper and he was appointed Lieutenant-General in the French Army in 1823 and, in 1830, later accompanied King Charles X to exile in Scotland.