Pope Pius XI and Eugenio Pacelli on the Vatican Radio Inauguration, 1931 - Catholic Stock Photo

Pope Pius XI, born Ambrogio Damiano Achille Ratti, was head of the Catholic Church from 6 February 1922 to his death in 1939. He was the first sovereign of Vatican City from its creation as an independent state on 11 February 1929. Wikipedia

Pope Pius XII, born Eugenio Maria Giuseppe Giovanni Pacelli, was head of the Catholic Church and sovereign of the Vatican City State from 2 March 1939 until his death in 1958. Wikipedia