authored by Krupp; the book reproduces 225 pages of the new documents produced by the foundation's research. Mark Riebling argued in his 2015 book Church of Spies that Pius XII was involved in plots to overthrow Hitler from mid-October 1939 and was prepared to mediate a peace between the Allies and the Axis in the event of a regime change in Germany. The courier between the resistance group under Admiral Canaris and the Pope was the Bavarian lawyer and Catholic politician Joseph Müller. Opening of the Vatican Secret Archives On the occasion of the 80th anniversary of the appointment of Pius XII as Bishop of Rome, Pope Francis announced during an audience for staff of the Vatican Secret Archives on 4 March 2019 that Vatican archival materials pertaining to Pius XII's pontificate will be accessible to scholars beginning on 2 March 2020. While this announcement was welcome by researchers, much of it has been clouded by the role of Pope Pius XII with regard to the Holocaust. However, archival research of this period should inform a much broader shift within global Christianity, from Europe to the global South. The Vatican archives have provided many millions of pages and it is expected to take many years to process the findings. As of May 2021, the study of the archive has been inconclusive. In January 2022, historian Michael Feldkamp announced that he had discovered in the Vatican archives evidence that Pius XII had personally saved at least 15,000 Jews from extermination, and that he had sent a report on the Holocaust to the American government shortly after the Wannsee Conference, although they did not believe the pope. In June 2022, David Kertzer, one of the first historians to have analyzed the archives, published his book The Pope at War. Kertzer, with the support of thousands of unpublished documents, uncovered the existence of secret negotiations between Hitler and Pius XII already a few weeks after the end of the conclave, promoted by Hitler himself with the intention of improving his relations with the Vatican. Pius XII, for his part, concentrated his efforts on protecting and improving the situation of the Church in Germany in the face of the anti-Catholic policies of the Nazis, although both sides could not reach any agreement. See also Cardinals created by Pius XII List of people from Rome List of popes List of saints canonized by Pope Pius