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Second Vatican Council, (1962–65), 21st ecumenical council of the Roman Catholic Church, announced by Pope John XXIII on January 25, 1959, as a means of spiritual renewal for the church and as an occasion for Christians separated from Rome to join in a search for Christian unity. Vatican II, as the council is also known, produced 16 documents that enacted many modernizing changes in the church according to the theme of aggiornamento (Italian: “bringing up...