Madame Royale was a style customarily used for the eldest living unmarried daughter of a reigning French monarch.
Marie-Thérèse, daughter of Louis XVI
Marie Thérèse of France was a French princess, a fille de France. She was the fourth child of King Louis XIV and Queen Maria Theresa. As the eldest surviving daughter of a French king, she was known a
Portrait by Nocret, c. 1671
Queen Maria Theresa and her children from the Mythological portrait of Louis XIV and the royal family by Nocret (1670)
Engraving of Marie Thérèse