Sculptor Countess Bianca Fischler von Treuberg was born in Munich, Germany on 29 September 1913. She spent her childhood in Italy and started to sculpt at the age of six, exhibiting at the Biennale in Rome at the age of twelve and later attending classes at the Academy of Rome, one of the youngest students to do so. In 1929 she moved to Paris, where she befriended Italian sculptor Alberto Giacometti and the painters André Derain and Balthus, before moving to London and setting up a studio in Drayton Gardens. In 1932 she married Prince Leopold of Löwenstein, who had emigrated from Germany in the 1920s (their son Rupert Lowenstein became the Rolling Stones' financial manager). After their divorce Von Treuberg moved to the USA in the 1960s, where she married the diplomat Peter Rosoff and gave private sculpture classes, later returning to England.
She exhibited under numerous names including Princess Lowenstein, Bianca Rosoff and Bianca including at the Wildenstein Gallery in London in 1939, in the June 1944 Free German League of Culture (FGLC) exhibition and in a mixed exhibition at Ben Uri in 1945. Her sculptural commissions include heads of Norman Mailer, Sir Victor Schuster and Trevor Howard, among others. As Bianca Rosoff, she played a small role in the film Maidstone by Norman Mailer in 1970. She died in London, England in 1979. Her bronze portrait of Field Marshall Sir Claude Auchinleck (1959) is at the National Army Museum, and a bust of the composer Herbert Howells (c. 1965) is held at the Royal College of Music, London. She also designed a gold-painted fibreglass sculpture for the front of the Trafalgar House office block in Suffolk Street, Birmingham in 1960 and an abstract for the façade of Quebec House in Kingston Upon Thames in 1961.