Pius XII Defines Dogma: Papal Infallibility Asserted
Pope Pius XII invoked papal infallibility to formally declare the Assumption of Mary as Catholic dogma, the first and only use of this supreme doctrinal authority since its definition in 1870. The declaration obligated 500 million Catholics worldwide to accept that Mary was bodily taken into heaven at the end of her earthly life.
November 1, 1950
76 years ago
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