[2] Leveson-Gower was the third son and youngest child of Granville Leveson-Gower, 1st Earl Granville and his wife Lady Harriet Elizabeth Cavendish, second daughter of Lady Georgiana Spencer and William Cavendish, 5th Duke of Devonshire.

[4] Leveson-Gower entered the British House of Commons for Derby with the support of his uncle William Cavendish, 6th Duke of Devonshire in May 1847.

[5] From 1851, he worked as précis writer in the Foreign Office until the following year,[4] when by the influence of his cousin George Sutherland-Leveson-Gower, 2nd Duke of Sutherland, he stood successfully as a Member of Parliament (MP) for Stoke-upon-Trent.

[4] They had two children, one surviving: Three days after the birth of their son, Lady Margaret died of measles contracted during her pregnancy, aged 28.

[9] Leveson-Gower never remarried and died in 1907, aged 88, having been in his later life a friend of William Ewart Gladstone and his wife.