After three major apparitions of the Virgin Mary, which occurred during the 19th century, at La Salette in 1846, at Lourdes in 1858, and at Castelpetroso in 1888, Our Lady appeared in 1917, for the first time in the 20th century, at Fatima in Portugal.
In all these apparitions, as well as in 1432 in Caravaggio and in 1531 in Guadalupe in Mexico, the Virgin addressed herself to boys or young men of humble social conditions, mostly devoted to sheep farming. In this way she indicated her predilection for simple and innocent souls, to whom she entrusted her messages to sinful humanity, invoking repentance and exhorting them to prayer.