History of The Immaculate Heart of Mary.
In 1917 Our Lady of Fatima, appeared to three Children, in the second and third apparitions in June, and July, she tells the Children “Jesus wishes to make use of you to make me known and loved. He wishes to establish in the world devotion to my Immaculate Heart”, and Our Lady showed them for the first time her Immaculate Heart encircled by thorns which pierced it, and seeking reparation.
Our Lady of Fatima taught them to “sacrifice yourselves for sinners, and say many times, especially whenever you make some sacrifice: “O Jesus, it is for love of you, for the conversion of sinners, and in reparation for the sins committed against the Immaculate Heart of Mary.
Our Lady’s requests for the consecration of Russia and the Five First Saturdays Communion of Reparation. Our Lady says, “in the end my Immaculate Heart will triumph”. Our Lady told: “It will not be long now before you go to heaven. You will remain here to make known that God wishes to establish in the world devotion to the Immaculate Heart of Mary. When you are to say this, don’t go and hide. Tell everybody that God grants us graces through the Immaculate Heart of Mary, that people are to ask her for them, and that the Heart of Jesus wants the Immaculate Heart of Mary to be venerated at His side. Tell them also to pray to the Immaculate Heart of Mary for peace, since God has entrusted it to her.
Later on In 1925 a few years later, Our Lady appeared to Sister Lucia, telling her to spread devotion to her Immaculate Heart. Sister Lucia In her book, Sister Lucia wrote three pages in her book on “The Call to Devotion to the Immaculate Heart of Mary” (pages. 135-137).
Pope Pius XII instituted the 'Feast of the Immaculate Heart of Mary' in 1944 to be celebrated on 22 August, coinciding with the traditional octave day of the Assumption. Later the Feast of the Immaculate Heart of Mary was moved In 1969, Pope Paul VI, moved the celebration of the Immaculate Heart of Mary to the Saturday, immediately after the Solemnity of the Sacred Heart of Jesus. This means in practice that the 'Feast of the Immaculate Heart of Mary' it is now held on the third Saturday after Pentecost.