Marie Adélaïde de France, known as Madame Adélaïde (23 March 1732 in Versailles – 27 February 1800 in Trieste), was a French princess, the fourth daughter and sixth child of King Louis XV of France and his consort, Marie Leszczyńska. As the legitimate daughter of the king, she was a fille de France. She was referred to as Madame Quatrième (Madame the Fourth), until the death of her older sister Louise Marie in 1733, as Madame Troisième, (Madame the Third); as Madame Adélaïde from 1737 to 1755; as Madame from 1755 to 1759; and then as Madame Adélaïde again from 1759 until her death. Adélaïde possessed the Duchy of Louvois with her sister Madame Sophie from 1777 until 1792, which had been created for them by their nephew Louis XVI, in their own right. (https://en.wikipedia.org/wiki/Adélaïde_of_France_(1732–1800) )