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Louise Marie Adélaïde de Bourbon, Duchess of Orléans (13 March 1753 - 23 June 1821), was the daughter of Louis Jean Marie de Bourbon, Duke of Penthièvre and Princess Maria Teresa d'Este. At the death of her brother, Louis Alexandre, Prince of Lamballe, she became the wealthiest heiress in France prior to the French Revolution. She married Louis Philippe II, Duke of Orléans, the "regicide" Philippe Égalité, and was the mother of France's last king, Louis Philippe I. She was sister-in-law to Marie Thérèse Louise, Princess of Lamballe, and was the last member of the Bourbon-Penthièvre family.