Mary Sackville (1792–1864)
| Mary Sackville | |
|---|---|
| Lady Mary Sackville | |
Mary, Countess of Plymouth c. 1817 | |
| Born | 30 July 1792 |
| Died | 20 July 1864 (aged 71) |
| Husband | Other Windsor (1811–1833) William Amherst (1839–1857) |
| Father | John Sackville |
| Mother | Arabella Diana Cope |
Lady Mary Sackville (30 July 1792 – 20 July 1864), also known by her married names as the Mary, Countess of Plymouth and the Countess Amherst of Arracan, was a British noblewoman.