| Sacerdotii nostri primordia Latin for 'From the beginning of our priesthood' Encyclical of Pope John XXIII | |
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| Signature date | 1 August 1959 |
| Subject | About St. John Vianney |
| Number | 2 of 8 of the pontificate |
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Sacerdotii nostri primordia ("From the beginning of our priesthood") was the second encyclical of Pope John XXIII, issued 1 August 1959. It commemorated the 100th anniversary of the death of St. John Vianney, the patron saint of priests.