Charles O'Brien, 6th Viscount Clare
Charles O'Brien was the son of Charles O'Brien, 5th Viscount Clare and Charlotte Bulkeley, the sister of Anne, second wife of James FitzJames, 1st Duke of Berwick and Marshal of France. He fought for France against Spain in 1718 with the rank of colonel in the service of his father's regiment and later fought in the War of the Polish Succession in the Siege of Philippsburg in June 1734, where he was wounded. He gained the rank of Maréchal de Camp in 1735 in the service of the King's Armies. O'Brien also fought in the Battle of Dettingen in 1743 and in the Battle of Fontenoy in 1745.
O'Brien was invested as a Knight, L'Ordre du Saint-Esprit of France on 2 February 1746 at the chapel of Versailles, Île-de-France, France. He held the office of Governor of Neuf-Brisach in Alsace, and was Commander-in-Chief of the province of Languedoc. In 1757 he was made a Marshal of France. He died on 9 September 1761, aged 62, at Montpellier, France.
O'Brien married Marie Genevieve Louise Gautier, daughter of François Gautier, marquis de Chiffreville, in 1755 and had three children:
- Charles O'Brien, 7th Viscount Clare
- Antoinette Charlotte Marie Septimanie O'Brien (1759-1808), married Antoine César de Choiseul, Duke of Praslin.
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- Chisholm, Hugh, ed. (1911). Encyclopædia Britannica. 26 (11th ed.). Cambridge University Press. p. 869. .
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