Jacques Charles de Fitz-James, 5th Duke of Fitz-James (16 November 1743 – 11 August 1805) was a French-born nobleman who was a grandson of James FitzJames, 1st Duke of Berwick, himself an illegitimate son of King James II and VII by Arabella Churchill, herself a sister of the 1st Duke of Marlborough[1] while his mother was a daughter of Charles Auguste de Goyon, Count of Gacé, Marshal of France.

[2] During the French Revolution, Fitz-James was also part of the Armée des Émigrés.

[3] On 26 December 1768, he married Marie Claudine Sylvie de Bissy, daughter of Henri Charles Gabriel de Bissy, Count of Thiard.