Pope Pius XII and the Holocaust
The papacy of Pius XII (Eugenio Pacelli) began on 2 March 1939 and continued to 9 October 1958, covering the period of the Second World War and the Holocaust, during which millions of Jews were murdered by Adolf Hitler's Nazi Germany. Before becoming pope, Cardinal Pacelli was a Vatican diplomat in Germany and then Vatican Secretary of State.
Source: Wikipedia — Pope Pius XII and the Holocaust (CC BY-SA 4.0)