<a href="https://en.wikipedia.org/wiki/Pope_John_XXIII" id="mwxg" rel="mw:WikiLink" title="Pope John XXIII">Pope John XXIII</a> issues <i id="mwxw"><a href="https://en.wikipedia.org/wiki/Pacem_in_terris" id="mwyA" rel="mw:WikiLink" title="Pacem in terris">Pacem in terris</a></i>, the first encyclical addressed to all Christians instead of only Catholics, and which described the conditions for world peace in human terms.