Lúcia de Jesus Rosa dos Santos, O.C.D., (28 March 1907 – 13 February 2005) also known as Lúcia of Fátima and by her religious name Sister Maria Lúcia of Jesus and of the Immaculate Heart, was a Portuguese Catholic Discalced Carmelite nun, one of the three children, along with her cousins Francisco and Jacinta Marto, who claimed to have witnessed Marian apparitions in Fátima in 1917.