<P> Although the belief that Mary was sinless , or conceived with an immaculate soul , has been widely held since Late Antiquity , the doctrine was not dogmatically defined until 1854 , by Pope Pius IX in his papal bull Ineffabilis Deus . The Catholic Church celebrates the Feast of the Immaculate Conception on December 8 ; in many Catholic countries , it is a holy day of obligation or patronal feast , and in some a national public holiday . </P>
<P> Although the belief that Mary was sinless , or conceived with an immaculate soul , has been widely held since Late Antiquity , the doctrine was not dogmatically defined until 1854 , by Pope Pius IX in his papal bull Ineffabilis Deus . The Catholic Church celebrates the Feast of the Immaculate Conception on December 8 ; in many Catholic countries , it is a holy day of obligation or patronal feast , and in some a national public holiday . </P>
when was the dogma of immaculate conception proclaimed
when was the dogma of immaculate conception proclaimed
1854
1854