Maartje Salomon Kannewasser, born 18 March 1888 in Den Helder, was a daughter of Salomon Aron Kannewasser and Jansje (Gittel) Leon Beek. She was unmarried and she worked as houskeeper.
When her brother Leon Kannewasser became a widower in 1924 and his wife Ester Philip Vrieslander had been interred, the unmarried Maartje Kannewasser came some time later living in with Leon at Zuidstraat 88 in Den Helder, where he runned a shop in haberdasheries. However in 1942 they had to move to Alkmaar where they lived in the McLaine Pontstraat 9 and from where they had to move again to Amsterdam on 25 June 1942. There they ended up in the Lekstraat 130 2nd floor. On 22 Febuary 1943, they had to move again and they then arrived at Reitzstraat 8 1st floor in Amsterdam-East.
Her brother Leon had this job with the Jewish Council and therefore exempted from deportation for the time being (gesperrt bis auf weiteres), but not Maartje. But at the time of the large-scale round-ups in Amsterdam of the 2nd half of May 1943, when all exemptions were cancelled by the Germans, Maartje and Leon Kannewasser were also arrested and taken to Westerbork, were they ended up 26 May 1943 in barrack 62. On 1 June both were put on transport to Sobibor where they – together with all other deportees – have been immediately killed upon arrival there on 4 June 1943.
Sources among others: City Archive of Amsterdam, archive cards of Maartje Salomon Kannewasser and Leon Salomon Kannewasser; the file cabinet of the Jewish Council, registration cards of Maartje Salomon Kannewasser and Leon Salomon Kannewasser and genealogical information of a visitor of the website.