Louisa Cavendish, Duchess of Devonshire

Louisa Frederica Augusta Cavendish, Duchess of Devonshire, formerly Louisa Montagu, Duchess of Manchester, née Luise Fredericke Auguste, Countess von Alten (15 June 1832, Hanover –15 July 1911) was a British aristocrat sometimes referred to as the "Double Duchess."

Louisa Frederica Augusta, Countess von Alten was born 15 June 1832 in Hanover. She was the daughter of Karl Franz Viktor, Count von Alten (1800–1879) and his wife, Hermine de Schminke (1806-1868).

She was appointed Mistress of the Robes to the Queen on 24 February 1858, and remained in that office until the fall of Lord Derby's government on 11 June 1859.

On 22 July 1852 she was married at Hanover to Viscount Mandeville, eldest son of the 6th Duke of Manchester. He succeeded his father as 7th Duke of Manchester on the 8 August 1855, and Louisa became Duchess of Manchester.

Before The Duke of Manchester's death in Naples on 22 March 1890, they had five children:

On 16 August 1892 at Christ Church, Mayfair, the sixty-year-old Dowager Duchess of Manchester married the Spencer Cavendish, 8th Duke of Devonshire, who had reportedly been in love with her for years. She thereby became Duchess of Devonshire; sometimes she is given the nickname "The Double Duchess".

After the Duke of Devonshire's death on 24 March 1908, she was widowed for the second time. On 15 July 1911, aged 79, The Duchess died after a seizure at the Sandown Races in Esher Park, Surrey, and was interred at Edensor, Derbyshire.

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