Issuance of Pacem in Terris

Date: April 11, 1963 • Location: Rome, Italy

Pope John XXIII issued Pacem in terris, the first papal encyclical addressed to "all men of good will" rather than only to Catholics.

Pope John XXIII was head of the Catholic Church and sovereign of Vatican City from 28 October 1958 until his death on 3 June 1963.

This milestone marked a defining occurrence in Italy's and world history, leaving an indelible imprint on societal development, international relations, and cultural memory. Its enduring ramifications continue to be examined and commemorated by historians and scholars across the globe.