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Rachel Pearsall Conn (Ray) Strachey nee Costelloe (1887 - 1940) was a British feminist activist and author. Her father was (Benjamin) Francis Conn Costelloe, a solicitor, and her mother was Mary Pearsall Smith, an aunt of Schreiner’s friend Alys Pearsall Smith. She married Oliver Strachey in 1911.
For further information see:
Barbara Caine (2004) ‘Strachey, Rachel Pearsall Conn [Ray] (1887-1940)’ Oxford Dictionary of National Biography Oxford University Press http://www.oxforddnb.com/view/article/38017