Pope Francis canonized two new saints Saturday at the beginning of a mass in Fátima, Portugal.Francisco and Jacinta Marto were small children in Fátima on May 13, 1917, when they said they saw a vision of the Virgin Mary while they were tending sheep. The farm town became an important Catholic shrine as a result of the children's visions, drawing pilgrims from around the world.Many such visitors were at the mass where the canonization was announced Saturday, and the declaration was met with joyous applause. The Associated Press reports that, according to the Vatican, about 500,000 people watched from the square in front of the shrine's basilica.One visitor from Ireland told the Associated Press, "It is amazing. It's like an answer to prayer, because I felt that always they would be canonized."According to the website for the Shrine of Fátima, the children saw a series of apparitions over the course of several months. By the time the Virgin Mary appeared to them for the sixth time, they had been joined by tens of thousands of Catholics who had come to pray with them.As NPR's Tom Gjelten has reported, the process of becoming a saint in the Catholic church is extensive.