Sister Lúcia in the context of "Our Lady of Fátima"

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 global Catholic 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.

The Sanctuary of Fátima (Portuguese: Santuário de Fátima), or Shrine of Fátima, also known as Sanctuary of Our Lady of Fátima (Portuguese: Santuário de Nossa Senhora de Fátima), is a group of Catholic Church religious buildings and structures located in Cova da Iria, in the civil parish and city of Fátima, in the municipality of Ourém, in Portugal.

In addition to the Basilica of Our Lady of the Rosary (Portuguese: Basílica de Nossa Senhora do Rosário), the shrine consists of the Chapel of the Lausperene (Portuguese: Capela do Lausperene), a great oak tree (near which the 1917 Marian apparitions occurred), a monument to the Sacred Heart of Jesus (Portuguese: Monumento ao Sagrado Coração de Jesus) and the Chapel of the Apparitions (Portuguese: Capelinha das Aparições), where three children, Lúcia Santos and her cousins, Jacinta and Francisco Marto, said they were first visited by the Virgin Mary. In addition, several other structures and monuments were built in the intervening years to commemorate the events.

The Fátima prayers (Portuguese pronunciation: [ˈfatimɐ]) are a collection of seven Catholic prayers associated with the 1917 Marian apparitions at Fátima, Portugal. Of the seven prayers, reportedly, the first two were taught to the three child visionaries by the Angel of Peace in 1916, the next three were taught to them by Our Lady of Fátima herself during the course of the apparitions, and the final two were taught to Lúcia de Jesus Rosa dos Santos (the eldest and last survivor of the three) in 1931 by Jesus Christ when she was already a nun. Of the seven prayers, the rosary decade prayer is the best-known and the most widely recited. For each prayer below, an English translation is given alongside the Portuguese original.