Francisco de Jesus Marto (11 June 1908 – 4 April 1919) and Jacinta de Jesus Marto (11 March 1910 – 20 February 1920) were siblings from Aljustrel, a small hamlet near Fátima, Portugal, who with their cousin Lúcia dos Santos (1907–2005) reportedly witnessed three apparitions of the Angel of Peace in 1916 and several apparitions of the Blessed Virgin Mary at Cova da Iria in 1917. The title Our Lady of Fátima was given to the Virgin Mary as a result, and the Sanctuary of Fátima became a major centre of world Christian pilgrimage. The two Marto children were solemnly canonized by Pope Francis at the Sanctuary of Our Lady of Fátima, in Portugal on 13 May 2017, the centennial of the first Apparition of Our Lady of Fátima. They are the youngest Catholic saints, with Jacinta being the youngest saint who did not die a martyr. Life The youngest children of Manuel and Olimpia Marto, Francisco and Jacinta were typical of Portuguese village children of that time. They were illiterate. According to the memoirs of their cousin Sister Lúcia, Francisco had a placid disposition, was somewhat musically inclined, and liked to be by himself to think. Jacinta was affectionate with a sweet singing voice and a gift for dancing. Following their experiences, their fundamental personalities remained the same. Francisco preferred to pray alone, saying that this would "console Jesus for the sins of the world". Jacinta said she was deeply affected by a terrifying vision of Hell shown to the children at the third apparition, and deeply convinced of the need to save sinners through penance and sacrifice as the Virgin had told the children to do. All three children, but particularly Francisco and Jacinta, practiced stringent self-mortifications to this end. The Congregation for the Causes of Saints, in the report that confirmed Jacinta as beatified, observed that she seemed to have an "insatiable hunger for immolation." By this the Congregation was referring to immolation as offering in sacrifice. Apparitions The brother and sister, who tended to their families’ sheep with their cousin Lúcia in the fields of Fátima, Portugal, reported seeing several apparitions of an angel in 1916. Lúcia later recorded the words of several prayers she said they learned from this angel. Sister Lúcia wrote in her memoirs that she and her cousins saw the first apparition of Mary on 13 May 1917. At the time of