Countess Louise von Alten

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.

Lady Eleanor Stanley recorded in her diary in 1859 that while participating in a paper chase, the Duchess was involved in a crinoline fashion-related disaster when she caught her hoop while climbing over a stile, and was left with the entirety of her crinoline and skirts thrown over her head, revealing her scarlet drawers to the assembled company. The Duc de Malakoff, the French ambassador, is said to have exclaimed 'c'stait diabolique!' at the sight.

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:

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