Rosa Rosenberg, née Abt, was the mother of Friedrich Rosenberg. She was the wife of Hermann Rosenberg, who died in March 1938 in Göttingen. She left Göttingen on 9 September 1939 to join her son Friedrich in Amsterdam. Source: Uta Schäfer-Richter,Jörg Klein, Die jüdischen Bürger im Kreis Göttingen, 1933-1945: ein Gedenkbuch ..., p. 226; online.