The devotion commonly known as that of the Miraculous Medal owes its origin to Zoe Labore, a member of the Daughters of Charity of St. Vincent de Paul, known in religion as Sister Catherine [Note: She was subsequently canonized], to whom the Blessed Virgin Mary appeared three separate times in the year 1830, at the mother-house of the community at Paris. The first of these apparitions occurred 18 July, the second 27 November, and the third a short time later. On the second occasion, Sister Catherine records that the Blessed Virgin appeared as if standing on a globe, and bearing a globe in her hands. As if from rings set with precious stones dazzling rays of light were emitted from her fingers. These, she said, were symbols of the graces which would be bestowed on all who asked for them. Sister Catherine adds that around the figure appeared an oval frame bearing in golden letters the words “O Mary, conceived without sin, pray for us who have recourse to thee”; on the back appeared the letter M, surmounted by a cross, with a crossbar beneath it, and under all the Sacred Hearts of Jesus and Mary, the former surrounded by a crown of thorns, and the latter pierced by a sword.
At the second and third of these visions a command was given to have a medal struck after the model revealed, and a promise of great graces was made to those who wear it when blessed. After careful investigation, M. Aladel, the spiritual director of Sister Catherine, obtained the approval of Mgr. de Quelen, Archbishop of Paris, and on 30 June, 1832, the first medals were struck and with their distribution the devotion spread rapidly.
O Mary conceived without original sin pray for us who have recourse to Thee; do we really always meant it when we utter these words of abandonment to the Immaculata ?
O Lord Jesus Christ, Who has willed that the most Blessed Virgin Mary, Your mother, sinless from the first moment of Her conception, should be glorified by countless miracles: grant that we, who never cease from imploring Her patronage, may attain in the end to eternal happiness. who lives and reigns, with God the Father, in the unity of the Holy Ghost, God, forever and ever. Amen.