The Reichskonkordat was signed by the Cardinal Secretary of State under Pope Pius XI and the Vice Chancellor under which leader?
Reichskonkordat:  It was signed on 20 July 1933 by Cardinal Secretary of State Eugenio Pacelli, who later became Pope Pius XII, on behalf of Pope Pius XI and Vice Chancellor Franz von Papen on behalf of President Paul von Hindenburg and the German government. Franz von Papen:  He served as Chancellor of Germany in 1932 and as Vice-Chancellor under Adolf Hitler in 1933–34.
Adolf Hitler