Ad Petri Cathedram
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| Originally published | June 29, 1959 |
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| Authors | Pope John XXIII |
| Date | June 29, 1959 |
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| Date of Upd. | |
| ID | 3084619 |
About Ad Petri Cathedram
Ad Petri Cathedram was the first encyclical issued by Pope John XXIII on 29 June 1959. It was promulgated eight months into the pontificate and addresses truth, unity and peace in the spirit of charity. The document makes several references to the planned Second Vatican Ecumenical Council later held during 1962–1965.
