Mary gave the children three secrets. Since Francisco died in 1919 and Jacinta the following year, Lucia, who later became a Carmelite nun, revealed the first secret in 1927, concerning devotion to the Immaculate Heart of Mary. The second secret was a vision of hell.
Pope John Paul II directed the Holy See's Secretary of State to reveal the third secret in 2000; it spoke of a 'bishop in white' who was shot by a group of soldiers who fired bullets and arrows into him. Many people linked this to the assassination attempt against Pope John Paul II in St. Peter's Square on May 13, 1981.
The feast of Our Lady of Fatima was approved by the local bishop in 1930; it was added to the Church's worldwide calendar in 2002. Sister Lucia died in 2005 at the age of 97.