Elizabeth Russell, born Mary Annette Beauchamp (1866–1941), was a novelist who in 1891 married Graf von Arnim-Schlagenthin. She became known as “Elizabeth”, the name she used in publishing Elizabeth and Her German Garden (1898), and she remained widely known as Elizabeth von Arnim, although the Library of Congress catalogues her as Mary Annette (Beauchamp), Countess von Arnim. She was a widow when she married BR’s brother, Frank, on 11 February 1916. The marriage was quickly in difficulty; she left it for good in March 1919, but they were never divorced and she remained Countess Russell (becoming Dowager Countess after Frank’s death in 1931). See Joyce Morgan, The Countess from Kirribilli (2021).