Giovanni Battista Montini was born in Concesio, near Brescia, to a Catholic newspaper editor and a noblewoman of strong piety. His health was fragile from boyhood. Ordained in 1920, he spent thirty years in the Vatican Secretariat of State (under Pius XI and Pius XII), helping shape Catholic Action and the wartime humanitarian effort. Made Archbishop of Milan in 1954, he became a 'workers' archbishop' in the heart of postwar industrial Italy.
Elected pope in June 1963 after the death of John XXIII, he immediately committed himself to continuing the Council. He presided over its three remaining sessions, promulgated all sixteen of its documents, and undertook the herculean task of implementing its reforms — a liturgical reform (the new Missal of 1969), a curial reform, an ecumenical opening (the meetings with the Ecumenical Patriarch Athenagoras in Jerusalem, 1964, ending the mutual excommunications of 1054), and a dialogue with the modern world.
In 1968 he issued Humanae Vitae, the encyclical reaffirming the Church's traditional rejection of artificial contraception. The reception was bitter: many of his closest collaborators dissented publicly; episcopal conferences hedged; Paul never wrote another encyclical for the remaining decade of his life. His final years were marked by deepening sorrow — the kidnapping and murder of his close personal friend, the former prime minister Aldo Moro, in 1978 led to one of the most anguished public letters of any modern pope. He died at Castel Gandolfo on the feast of the Transfiguration, August 6, 1978.
Canonised by Francis on October 14, 2018, jointly with St. Óscar Romero of El Salvador. With this canonisation, the three popes who guided the Catholic Church through the Second Vatican Council — John XXIII, Paul VI, and John Paul II — are all saints.

