Lina Dorina Johanna Eckenstein (23 September 1857 – 4 May 1931) was a British polymath and historian who was acknowledged as a philosopher and scholar in the women's movement. Eckenstein's father was a Jewish socialist from Bonn who had fled Germany following the failed revolution of 1848. Eckenstein was born in Islington, London, in 1857; the highly independent mountaineer Oscar Eckenstein was her younger brother.[1] Eckerstein had a large range of languages which she is thought to have obtained at some educational facility in Switzerland or Germany.[2] She came to notice after joining a club started by the mathematician (and in time eugenicist) Karl Pearson which allowed middle-class radicals to talk about sex. The club, called the Men and Women's Club, operated during the late 1880s. Eckenstein was seen as a "new woman" and she presented studies she had made of the sexual relations of the Romans and of Swiss men and women during the Reformation.[2] The club discussed feminist and liberal issues including ending any state legal interference in prostitution and whether motherhood should be reimbursed.[2] Karl and Maria Pearson and their children, Sigrid, Helga, and Egon, were to permanently remain as Eckenstein's friends Less