Élisabeth Philippe Marie Hélène of France, also known as Madame Élisabeth, was a French princess. She was the youngest child of Louis, Dauphin of France, and Duchess Maria Josepha of Saxony, and she was a sister of King Louis XVI. Élisabeth's father, the Dauphin, was the son and heir of King Louis XV and his popular wife, Queen Marie Leszczyńska. Élisabeth remained beside her brother and his family during the French Revolution, and she was executed during the Reign of Terror at the Place de la Révolution. Regarded as a martyr by the Catholic Church, Élisabeth was declared a servant of God by Pope Pius XII.

Louise-Marie of France, OCD was a French princess and Discalced Carmelite, the youngest of the ten children of King Louis XV and Queen Maria Leszczyńska. She entered the Carmelite convent at Saint-Denis in 1770 and took the religious name Thérèse of Saint Augustine. She served as prioress in 1773-1779 and 1785–1787.