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| Ad Caeli Reginam Latin for 'To the Queen of Heavens' Encyclical of Pope Pius XII | |
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| Signature date | 11 October 1954 |
| Number | 30 of 41 of the pontificate |
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Ad Caeli Reginam is an encyclical of Pope Pius XII, given at Rome, from St. Peter's Basilica, on the feast of the Maternity of the Blessed Virgin Mary, the eleventh day of October, 1954, towards the end of the Marian year, in the sixteenth year of his Pontificate. The encyclical is an important element of the Mariology of Pope Pius XII. It established the feast Queenship of Mary.