In 1791, Antoine Philippe was appointed an aide-de-camp, with the rank of sous-lieutenant in his brother's regiment 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 —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, 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. Returning to Europe in 1800, the royal House of Bourbon was still in exile from France, so the brothers set up in England at Twickenham. Later that year Antoine Philippe resolved to seek the hand in marriage of Lady Charlotte Adelaide Constantia Rawdon, daughter of the 1st Earl of Moira by his third wife, Elizabeth Hastings, 16th Baroness Botreaux. Despite her noble lineage, authorisation for the marriage was withheld by Louis, Count of Provence, and the couple never wed. In 1807 Antoine Philippe's pulmonary tuberculosis worsened. His elder brother wanted to take him to Devon to benefit from the fresh air but, twelve miles out of Twickenham, they had to stop at an inn at Salthill. Having a respiratory crisis, Antoine Philippe refused the ether Louis-Philippe wanted to administer and, murmuring to him "Give me your hand, I thought I was dying", expired. Louis Philippe had a funeral service held at the Catholic chapel on King Street in London, which Monsieur attended and, thanks toPrince Edward, Duke of Kent, obtained permission to bury his brother in Westminster Abbey.
Works
Relation de la captivité de S.A.S. Monsignor le duc de Montpensier, pendant les années 1793, 1794, 1795 et 1796, écrite par lui-même, Twickenham, Imprimerie de G. White, 1816
Mémoires de S.A.S. Louis-Antoine-Philippe d'Orléans, duc de Montpensier, Paris, Baudouin frères, 1824 –
