Pope Pius IX defines ex Cathedra the…

December 1854 CE

Pope Pius IX defines ex Cathedra the dogma of Immaculate Conception, which holds that the Blessed Virgin Mary was conceived without original sin, in the apostolic constitution Ineffabilis Deus of December 8, 1854.

Pius IX thus becomes one of the few Popes to issue a statement considered infallible by the Church.

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