Rosa Kraun was born in Rotterdam on 2 October 1903 as second child of Meijer Kraun from Bariezow (Russia) and his wife Sara Mest from Ostrolengka (Poland). On 12 November 1896 Meijer and Sara were “officially subscribed” in the Peoples Registry of Amsterdam. They lived among others in the so-called “Russian street” the Manegestraat nr. 8 and nr. 12. In Amsterdam their son Jacob was born in 1902 bu…