Boniface de Castellane

Marie Louis Jean Jay Georges Paul Ernest Boniface, Marquis de Castellane (17 January 1897 – 5 February 1946), was a French nobleman and diplomat.

Early life He was the eldest son of American railroad heiress Anna Gould and Boni de Castellane, who was known as a leading Belle Époque tastemaker. Among his siblings were Georges de Castellane (who married Florinda Fernández Anchorena, owner of the Fernández Anchorena Palace in Buenos Aires) and Jason "Jay" de Castellane. His parents divorced in 1906 after his father had spent about $10 million of her family's money, and his mother remarried to Boni's cousin Hélie de Talleyrand-Périgord, Duc de Sagan (son of the Boson de Talleyrand-Périgord), with whom she had two more children, Howard de Talleyrand-Périgord (who committed suicide in 1929), and Hélène Violette de Talleyrand-Périgord (who married Count James Robert de Pourtalès and Gaston Palewski). On 6 January 1921, while still known as the Count of Castellane, he was married to Yvonne Constance Patenôtre (1896–1981), in Paris with his uncle, Frank Gould, as best man. She was a daughter of Jules Patenôtre (formerly the French Ambassador to the United States) and Eleanor Elverson (the sister of James Elverson Jr. and daughter of publisher James Elverson Sr. by his wife Sallie Duvall, the three of them owners of The Philadelphia Inquirer). Together, they were the parents of three daughters: Pauline de Castellane (b. 1923), who married diplomat Charles Jehannot d'Huriel de Bartillat.