Margaretha Byström (born 2 August 1937, in Stockholm) is a Swedish actress (film, theater, television), writer and director. Margaretha is most famous for her portrayal as the elegant and ambitious Katarina Remmer in the long running Swedish soap opera Rederiet. Selected filmography. Paradise Place (1977) A Walk in the Sun (1978) References. External links. Margaretha Byström at IMDb. https://en.wikipedia.org/wiki/Margaretha_Bystr%C3%B6m