Augustin Louis Joseph Casimir Gustave de Franquetot, 3rd Duke of Coigny (4 September 1788 – 2 May 1865) was a French aristocrat and soldier.
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Early life
Franquetot was born in 1800 into the prominent Franquetot family. He was the son of François Marie Casimir de Franquetot, Marquis of Coigny (1756–1816), and Louise Gabrielle de Conflans (1743–1825). The family lived in Scotland as Émigrés of the French Revolution.
Both of his grandfathers were prominent soldiers and Marshals of France. His maternal grandparents were Louis de Brienne de Conflans d'Armentières, Marquis of Armentières, and, his first wife, Adélaïde Jeanne Françoise de Bouterou d'Aubigny. His paternal grandparents were François-Henri de Franquetot de Coigny and Marie Jeanne de Bonnevie. His aunt, Antoinette Jeanne Françoise "Fanny" de Franquetot de Coigny, married Count Horace François Bastien Sébastiani de La Porta, parents of Françoise, Duchess of Praslin, who was believed to have been murdered by her husband, Charles de Choiseul, 5th Duke of Praslin in August 1847. While awaiting trial by the Chamber of Peers, the Duke committed suicide by arsenic. Following the Teste–Cubières political corruption scandal revealed in May 1847, the affair only added to the popular discontent with the July Monarchy which culminated in the French Revolution of 1848.
Three brothers from the Guillotte family bought the fiefdom of Franquetot, on the Cotentin Peninsula in Normandy, in 1528. Their descendants took the surname de Franquetot and bought the neighboring fiefdom of Coigny in 1577, where they built the Château de Franquetot in 1598. In the 1720s, the château was enlarged and renovated by the Marquis of Coigny in the 1720s.