Ad Petri Cathedram
Encyclopedia
Ad Petri Cathedram was the first encyclical
Encyclical
An encyclical was originally a circular letter sent to all the churches of a particular area in the ancient Catholic Church. At that time, the word could be used for a letter sent out by any bishop...

 issued by Pope John XXIII
Pope John XXIII
-Papal election:Following the death of Pope Pius XII in 1958, Roncalli was elected Pope, to his great surprise. He had even arrived in the Vatican with a return train ticket to Venice. Many had considered Giovanni Battista Montini, Archbishop of Milan, a possible candidate, but, although archbishop...

 on 29 June, 1959. It was promulgated eight months into the pontificate and addresses truth, unity and peace. It was neither a trend-setting social
Social
The term social refers to a characteristic of living organisms...

 document or doctrinal
Doctrine
Doctrine is a codification of beliefs or a body of teachings or instructions, taught principles or positions, as the body of teachings in a branch of knowledge or belief system...

exposition, but instead a fatherly message which was seen as addressing its issues with warmth and concern.
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