Antoine Philippe, Duke of Montpensier

Louis Antoine Philippe d'Orléans, Duke of Montpensier (3 July 1775, Palais-Royal, Paris - 18 May 1807, Salthill, England) was a son of Louis Philippe, Duke of Orléans (nom de rėvolution: "Philippe Égalité") (1747–1793), and his duchess Louise Marie Adélaïde de Bourbon, Duchess of Orléans. He was the younger brother of Louis Philippe, later King of the French. Antoine had a deep affection for him, and they were only ever separated during the Reign of Terror and the events that followed between 1793 and 1797.

In 1791, Antoine Philippe was appointed an aide-de-camp, with the rank of sous-lieutenant in his brother's regiment (his brother, then duc de Chartres, was known as "Général Égalité.") He was made adjutant-general before the battle of Jemmapes, in which both he and his brother fought. In Paris at the time of the trial of Louis XVI, Antoine Philippe attempted unsuccessfully to persuade his father not to vote for the king's death.

In April 1793, whilst adjutant-general in the armée du Var, Antoine Philippe was arrested at the same time as the other Bourbons who had remained in France. He was imprisoned in Fort Saint-Jean at Marseille.

During his imprisonment, Antoine Philippe contracted the tuberculosis that eventually killed him. He also had an illegitimate child with Françoise Barbaroux — a son called Jean-Antoine-Philippe Dentend (7 July 1797 – 5 March 1858)—who became notary to the house of Orléans and in that role oversaw Louis Philippe's donation of his personal property in 1830 before his accession. Antoine never saw his child; on 13 fructidor year IV (30 August 1796), the French Directory decided to exile him to Philadelphia, where the French Republic's chargé-d'affaires in the United States of America granted him an annual pension of 15,000 francs. He set out on 5 November 1796, accompanied by his brother Louis Charles, comte de Beaujolais, and in February 1797 met Louis-Philippe in Philadelphia. For two years they travelled around New England, in the Great Lakes and Mississippi area.

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