Two of Marcus's daughters, Lowisa (1787-1842) and Hedda (1796-1834) married two brothers,
Aron von Reis and Moses von Reis of the successful von Reis family of
Gothenburg Jews. A number of famous Swedes have descended from Marcus and his wife Fredrika Isaksdotter (1760-1826, originally
Freideh Isaac), such as historian
Hugo Valentin, TV producer
Gunilla Marcus-Luboff, the
Bonnier publishing dynasty, opera star
Isa Quensel, industrialist
Stefan Anderson, photographer
Mattias Klum, pop entertainer
Magnus Uggla. Usually, already the early descendants of Marcus and Isaksdotter married into Swedish families which were not Jewish. American botanist-author
Siri von Reis in New York and daughter
Serena Altschul also descend from Marcus. The marked gravestone of Jacob Marcus can still be seen in the Jewish Cemetery of Norrköping. In 1900, a comprehensive account of the entire Marcus family and its descendants was published in Sweden as a large printed circular chart, and an extensive family roster was updated until 1942 by Curt Marcus. Beginning around that time, Jewish descent (no matter how diluted) was kept in low profile, especially during
World War II, despite
Sweden's neutrality. ==References==