St. Therese of Lisieux was a French Discalced Carmelite nun, popularly known as The Little Flower. She was a highly influential model of sanctity for others because of the "simplicity and practicality of her approach to the spiritual life." She entered Carmel at the early age of 15 and died of tuberculosis at the age of 24. Together with St. Francis of Assisi she is one of the most popular saints in the history of the Church. Pope Pius X called her "the greatest saint of modern times."