Eugenio Maria Giuseppe Giovanni Pacelli was born on March 2, 1876 at Rome to the noble Pacelli family. Ordained priest in 1899, Eugenio served in the Vatican diplomatic corps — as Papal Nuncio to Bavaria (1917–1925) and to Germany (1920–1929).
In 1929, Eugenio was consecrated Cardinal. In 1930, Pope Pius XI appointed him Secretary of State.
On March 2, 1939 (his 63rd birthday), Eugenio was elected Pope, taking the name Pius XII. His 19-year pontificate (1939–1958) spanned the World War II period and the early Cold War.
During World War II, Pius XII maintained the Vatican's diplomatic neutrality while undertaking the systematic humanitarian rescue: personally opening the Vatican, Castel Gandolfo, and Roman religious houses to shelter thousands of Roman Jews from the Nazi October 1943 deportations. The Vatican-organized rescue saved documented 4,000+ Roman Jews — the 'Pius XII Rescue' tradition.
Pius XII proclaimed the dogma of the Assumption of the Blessed Virgin Mary on November 1, 1950 by the Apostolic Constitution *Munificentissimus Deus* — the most recent Catholic Marian dogma.
In 1951, Pius XII established the Ave Maria Feast (October 12, the Marian Marian Feast to commemorate the 400th anniversary of the Christianization of the Americas), and other Marian devotional acts.
He died at Castel Gandolfo on October 9, 1958 at the age of 82. Declared Venerable December 19, 2009 by Pope Benedict XVI.

