Pius IX Declares Immaculate Conception Dogma
Pope Pius IX issued the apostolic constitution *Ineffabilis Deus* to formally declare that the Virgin Mary remained free from original sin from the moment of her conception. This definitive ruling settled centuries of theological debate by establishing a core Catholic dogma that shaped Marian devotion and church authority for generations.
December 8, 1854
172 years ago
What Else Happened on December 8
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