Ad Diem Illum
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| Originally published | February 2, 1904 |
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| Authors | Pope Pius X |
| Date | February 2, 1904 |
| Date of Reg. | |
| Date of Upd. | |
| ID | 1084488 |
About Ad Diem Illum
Ad diem illum laetissimum is an encyclical of Pope Pius X, on the Immaculate Conception dated 2 February 1904, in the first year of his Pontificate. It is issued in commemoration of the fiftieth anniversary of the dogma of the Immaculate conception.
