In 1858, in an apparition the Church has approved as true and worthy of the belief and devotion of Catholics, the Blessed Virgin appeared to St. Bernadette Soubirou and called herself, "The Immaculate Conception", thereby identifying herself by the doctrine of the same name that had been declared in 1854.
A:
Pope Pius IX proclaimed the doctrine of the Immaculate Conception in 1854. Strictly speaking, this was not an infallible doctrine, as the First Vatican Council had not yet approved the doctrine of papal infallibility. However, in 1870 the Vatican Council voted almost unanimously for the doctrine of papal infallibility, with only 2 opposed. One of Pius' opponents at the Council was subsequently excommunicated.
Catholic Answer:
The doctrine of the Immaculate Conception was defined and declared by Pope Pius IX on December 8, 1854.
The year 1854.
The Immaculate Conception
Kalinis-linisang Paglilihi
The dogma of the Immaculate Conception was officially proclained in 1854 by Pope Pius IX. It affirmed that the Blessed Virgin was born without the stain of Original Sin.
Pope Pius IX declared the Immaculate Conception of Mary an article of faith on the day of December 8, 1854. According to his pronouncement in Ineffabilis Deus, Mary was given grace to be sinless at the instant of her conception.
There is no record of the Immaculate Conception Cathedral in Montreal, Canada. There is Cathedrale de lÕImmaculee-Conception in Edmundston, Cathedral of the Immaculate Conception and Former Cathedral of the Immaculate Conception in Grand Falls, Cathedral of St. Mary of the Immaculate Conception in Kingston, and Cathedral of the Immaculate Conception in Saint John, New Brunswick.
The Feast of the Immaculate Conception is on December 8th.
Immaculate Conception Academy was created in 1947.
Immaculate Conception Delta was created in 1977.
Congregation of the Immaculate Conception was created in 1484.
Fortress of the Immaculate Conception was created in 1675.
Shrine of the Immaculate Conception was created in 1869.