Pope Pius XII , born Eugenio Maria Giuseppe Giovanni Pacelli ; 2 March 1876 – 9 October 1958), was head of the Catholic Church and sovereign of the Vatican City State from 2 March 1939 until his death in 1958. Before his election to the papacy, he served as secretary of the Department of Extraordinary Ecclesiastical Affairs, papal nuncio to Germany, and Cardinal Secretary of State, in which capacity he worked to conclude treaties with European and Latin American nations, such as the Reichskonkordat with Nazi Germany.  During his papacy, the Church issued the Decree against Communism, declaring that Catholics who profess Communist doctrine are to be excommunicated as apostates from the Christian faith. The Church experienced severe persecution and mass deportations of Catholic clergy in the Eastern Bloc. He explicitly invoked ex cathedra papal infallibility with the dogma of the Assumption of Mary in his Apostolic constitution Munificentissimus Deus.[5] His magisterium includes almost 1,000 addresses and radio broadcasts. His forty-one encyclicals include Mystici corporis, the Church as the Body of Christ; Mediator Dei on liturgy reform; and Humani generis, in which he instructed theologians to adhere to episcopal teaching and allowed that the human body might have evolved from earlier forms. He eliminated the Italian majority in the College of Cardinals in 1946.