The Immaculate Conception, a solemnity celebrated on December 8, is the patronal feast of the United States. In 1854, Pope Pius IX's solemn declaration, Ineffabilis Deus (link al documento que ...

Ten years later the Sorbonne in Paris required all its degree candidates to pledge an oath to defend the Immaculate Conception of Mary. Pope Sixtus IV in 1476 approved the feast with its proper Mass ...

He also dedicated a chapel to the Immaculate Virgin in St. Peter's Basilica. The Mass and Office of the Immaculate Conception was approved for the whole Church by Pope Innocent XII in 1695 and the ...

The Solemnity of the Immaculate Conception is also a holy day of obligation for Catholics, meaning they are required to attend the Holy Mass. Since the liturgical celebration was transferred to ...

When a holy day of obligation falls on a Sunday and so is transferred to another day, the Catholic faithful are encouraged to ...

Pope Pius IX formally instituted the celebration of the Immaculate Conception when he proclaimed this dogma on December 8, 1854. Affirming the constant faith of the Church, he expressed in that ...