Louise Henriette de Bourbon, Mademoiselle de Conti at birth, was a French princess, who, by marriage, became Duchess of Chartres (1743–1752), then Duchess of Orléans (1752–1759) upon the death of her father-in-law. On 4 February 1752, her husband became the head of the House of Orléans, and the First Prince of the Blood, the most important personage after the immediate members of the royal family.