Pope Pius XII declared the Assumption of Mary as dogma.
On November 1, 1950, Pope Pius XII defined the Assumption of the Blessed Virgin Mary as dogma in the apostolic constitution Munificentissimus Deus. This dogma declares that Mary was assumed into heaven, body and soul, at the end of her earthly life. This declaration was significant as it was the first ex cathedra pronouncement since the Immaculate Conception, strengthening Marian beliefs within Catholic theology. The proclamation held substantial religious importance as it confirmed longstanding beliefs about Mary's role and status, reinforcing her as a central figure in Marian devotion and Catholic doctrine.