Louis Marie Florent du Châtelet

Louis-Marie-Florent de Lomont d'Haraucourt, marquis later duc du Châtelet (20 November 1727, Semur-en-Auxois - 13 December 1793, Paris), was an aristocratic French Army general and diplomat of the Ancien Régime.

The Duke served as Governor of Semur-en-Auxois in Burgundy as well as Ambassador to the Court of St James's, besides other appointments. He was appointed to command the Regiment of French Guards shortly before the outbreak of the Revolution in 1789. Châtelet was subsequently imprisoned and guillotined, in 1793 aged 66.

The son and heir of the noble and ancient , his mother, Émilie du Châtelet, famously was a scientist and the lover of Voltaire.

On 20 June 1725, his father Florent-Claude du Chastelet married Gabrielle-Émilie, daughter of Louis Nicolas le Tonnelier de Breteuil. Like many marriages among the French nobility, theirs was an arranged marriage. The couple found they had little in common, but proprieties were observed in accordance with contemporary norms.

The Marquis and Marchioness produced three children: Françoise-Gabriel-Pauline (1726-1754), duchesse de Montenegro, Louis-Marie-Florent (later duc du Châtelet) and Victor-Esprit (born and died 1734). After bearing three children, Émilie, marquise du Châtelet considered her marital responsibilities fulfilled and reached an agreement with her husband to live separate lives while still maintaining one household.

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