The famed shrine is piously known for the purported foot imprint of the Madonna and the revelation of a water fountain, which serves as the main veneration for its religious devotees.
Pope Pius X raised her shrine to the status of Minor Basilica via the Pontifical decree Templa Dei Antiqua on 7 May 1906.
She said that on 26 May 1432, Mary appeared in a field in Caravaggio, in Northern Italy, in the region of Milan; and said that her Son was angry, that for him people should fast on Fridays and for her they should celebrate Saturdays after vespers.
The Virgin Mary announced peace to Giovannette in her family, among the neighboring warring states and reconciliation between the Church in the East and West, through the Council of Florence (1436—1445).
[1] Eventually a modest shrine was built at the place of the apparition thanks to the Duke of Milan, Filippo Maria Visconti.