The answer is:
Marie Antoinette
Marie Antoinette was an Archduchess of Austria and Queen of France and of Navarre.
At the age of fourteen, on the day of her marriage to Louis-Auguste, Dauphin of France, she became Dauphine de France. At the death of King Louis XV, in May 1774, her husband ascended the French throne as Louis XVI.
During the Reign of Terror, at the height of the French Revolution, Marie Antoinette's husband was deposed and the royal family was imprisoned. Marie Antoinette was tried, convicted of treason and executed by guillotine on 16 October 1793, nine months after her husband.