Lady Mary Isabella Somerset

Mary Manners, Duchess of Rutland
Born	(1756-08-01)1 August 1756
Died	2 September 1831(1831-09-02) (aged 75) London
Nationality	British
Spouse	Charles Manners, 4th Duke of Rutland ​ ​ (m. 1775; died 1787)​

Mary Isabella Manners, Duchess of Rutland, born Lady Mary Somerset (1 August 1756 – 2 September 1831) was a British politician and society hostess.