| Miserentissimus Redemptor Latin for 'Most Merciful Redeemer' Encyclical of Pope Pius XI | |
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| Signature date | 8 May 1928 |
| Subject | Reparation to the Sacred Heart |
| Number | 12 of 31 of the pontificate |
| Text | |
Miserentissimus Redemptor (English: "Most Merciful Redeemer") is the title of an encyclical by Pope Pius XI, promulgated on May 8, 1928, on reparation to the Sacred Heart.