Biography
Mary Catherine Sackville-West was born 23 July 1824 to George John Sackville-West, 5th Earl De La Warr (1791-1869) and Elizabeth Sackville, 1st Baroness Buckhurst (1795-1870) and died 6 December 1900 Holywood Park, Keston, Kent, England, United Kingdom of unspecified causes. She married James Brownlow William Gascoyne-Cecil, 2nd Marquess of Salisbury (1791-1868) 29 April 1847 . She married Edward Henry Stanley, 15th Earl of Derby (1826-1893) 5 July 1870 .
Children
| Name | Birth | Death | Joined with |
| Sackville Arthur Gascoyne-Cecil (1848-1898) | |||
| Mary Arabella Arthur Gascoyne-Cecil (1850-1903) | 26 April 1850 Hertfordshire, England, United Kingdom | 18 August 1903 Cuffnells Estate, Lyndhurst, Hampshire, England, United Kingdom | Alan Plantagenet Stewart, 10th Earl of Galloway (1835-1901) |
| Margaret Elizabeth Gascoyne-Cecil (1850-1919) | |||
| Arthur Gascoyne-Cecil (1851-1913) | |||
| Lionel Gascoyne-Cecil (1853-1901) | |||
Footnotes (including sources)
| ‡ General |
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