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Francisco de Jesus Marto (11 June 1908 – 4 April 1919) and Jacinta de Jesus Marto (5 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.