Ineffabilis Deus

Ineffabilis Deus (Latin for "Ineffable God") is an Apostolic constitution by Pope Pius IX. It defines the dogma of the Immaculate Conception of the Blessed Virgin Mary. The decree was promulgated on December 8, 1854, the date of the annual Feast of the Immaculate Conception. Mary's immaculate conception is one of only two pronouncements that were made ex cathedra (the other in Munificentissimus Deus regarding the Assumption of the Blessed Virgin) and is therefore considered by the Catholic Church to be infallible through the extraordinary magisterium.

Ineffabilis Deus

Ineffabilis Deus (Latin for "Ineffable God") is an Apostolic constitution by Pope Pius IX. It defines the dogma of the Immaculate Conception of the Blessed Virgin Mary. The decree was promulgated on December 8, 1854, the date of the annual Feast of the Immaculate Conception. Mary's immaculate conception is one of only two pronouncements that were made ex cathedra (the other in Munificentissimus Deus regarding the Assumption of the Blessed Virgin) and is therefore considered by the Catholic Church to be infallible through the extraordinary magisterium.