 Pacelli was appointed Apostolic Nuncio to Germany on 23 June 1920 , and — after the completion of a Bavarian concordat — his nunciature was moved to Berlin in August 1925 . Many of Pacelli 's Munich staff stayed with him for the rest of his life , including his advisor Robert Leiber and Sister Pascalina Lehnert — housekeeper , cook friend , and adviser for 41 years . In Berlin , Pacelli was Dean of the Diplomatic Corps and active in diplomatic and many social activities . He was aided by the German priest Ludwig Kaas , who was known for his expertise in Church @-@ state relations and was a full @-@ time politician , politically active in the Catholic Centre Party , a party he led following Wilhelm Marx 's resignation in October 1928 . While in Germany , he travelled to all regions , attended <unk> ( national gatherings of the faithful ) , and delivered some 50 sermons and speeches to the German people . In Berlin he lived in the Tiergarten quarter and threw parties for the official and diplomatic elite . Paul von Hindenburg , Gustav Stresemann , and other members of the Cabinet were regular guests . 
