Ineffabilis Deus (Latin for 'Ineffable God') is an apostolic constitution[1][2] by Pope Pius IX.[3] It defines the dogma of the Immaculate Conception of the Blessed Virgin Mary. The document was promulgated on December 8, 1854,[4] 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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