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 document was promulgated on December 8, 1854, the date of the annual Solemnity of the Immaculate Conception, and followed from a positive response to the encyclical Ubi primum.

Mary's immaculate conception is a pronouncement made ex cathedra and is therefore considered by the Catholic Church to be infallible through the extraordinary magisterium.

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