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Ineffabilis Deus
http://saints.sqpn.com/bvm00013.htmDefines the Immaculate Conception infallibly as dogma. Apostolic Constitution issued by Pope Pius IX on 8 December, 1854.
Submitted in section: Denominations: Catholicism: Saints: M: Blessed Virgin Mary: Doctrine: Immaculate Conception: Ineffabilis Deus