Mary Stuart, Countess of Bute, 1st Baroness Mount Stuart (néeWortley Montagu; 19 January 1718 – 6 November 1794) was the wife of British nobleman John Stuart, 3rd Earl of Bute, who served as Prime Minister from 1762 to 1763.
On 24 August 1736, she married John Stuart, 3rd Earl of Bute, who became the prime minister of Great Britain in 1762.[1] The couple had five sons and six daughters,[1] including:
Lady Mary Stuart (c. 1741 – 5 April 1824), married James Lowther, later created Earl of Lonsdale, on 7 September 1761
John Stuart, Lord Mount Stuart (30 June 1744 – 16 November 1814), politician who succeeded as 4th Earl of Bute and was later created Marquess of Bute
In 1774, Mary Delany wrote to her brother Bernard Granville, JacobiteDuke of Albemarle, saying: "You know so much of Lady Bute that I need say nothing of her agreeableness, her good sense, and good principles, which with great civility must be always pleasing."[5]