Mary Stanley, Countess of Derby

Mary Catherine Stanley
Countess of Derby
Born	Mary Catherine Sackville-West (1824-07-23)23 July 1824
Died	6 December 1900(1900-12-06) (aged 76)
Spouse(s)	James Gascoyne-Cecil, 2nd Marquess of Salisbury ​ ​ (m. 1847; died 1868)​ Edward Henry Stanley, 15th Earl of Derby ​ ​ (m. 1870; died 1893)​
Issue	5, including Mary Arabella
Father	George Sackville-West, 5th Earl De La Warr
Mother	Lady Elizabeth Sackville

Mary Stanley, Countess of Derby (previously known as Mary Gascoyne-Cecil, Marchioness of Salisbury, née Lady Mary Sackville-West; 23 July 1824 – 6 December 1900) was an English grande dame and political hostess.^[1]