Sara Marcus was a daughter of Bernhard Marcus and Friederika Roback. She was born in 1890 in Danzig and married in 1912 to Hugo Landau in Berlin, who was born 7 July 1887 in Vienna. However, she divorced him in Berlin on 12 July 1932 and arrived from there 6 December 1938 in Amsterdam, where she lived at Nieuwe Amstelstraat 35 1st floor and per September 1939 at Amstel 14 upperhouse. It is not kno…