Pope John XXIII (1881–1963; reigned 1958–1963) issued eight papal encyclicals during his five-year reign as pope of the Catholic Church. An encyclical is a letter issued by the pope that is usually addressed to Catholic bishops or laity in a particular area or of the whole world.
Pope John XXIII (1881–1963; reigned 1958–1963) issued eight papal pronouncements during his five-year term as the head of the Catholic Church, which are known as encyclicals and were addressed to Catholic bishops or laity in specific areas or globally.