Lady Dorothy Evelyn Macmillan (née Cavendish; 28 July 1900 – 21 May 1966) was an English socialite and the third daughter of Victor Cavendish, 9th Duke of Devonshire, and Evelyn Cavendish, Duchess of Devonshire. She was the spouse of the prime minister of the United Kingdom between 1957 and 1963, as the wife of Harold Macmillan.
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Family life
She spent her first eight years at Holker Hall, Lancashire (located in the county of Cumbria post-1974); and Lismore Castle, Ireland. She became known as Lady Dorothy from the age of eight, when her father succeeded to the dukedom of Devonshire, and the family moved into Chatsworth House, Derbyshire, and the other ducal estates. She received lessons in French, German, riding and golf. From the age of sixteen she lived with the family at Rideau Hall, Ottawa, where her father served as Governor General of Canada.
Marriage
In 1920 she married publisher and Conservative politician Harold Macmillan, who had been on her father's staff in Canada. Their lavish wedding, on 21 April at St Margaret's, Westminster, was attended by royalty, aristocracy and leading literary figures, and was hailed as the social event of the London season.
Lady Dorothy was a dutiful political wife and the couple remained married and publicly together (despite her long-lasting affair with Conservative politician Robert Boothby) until her death from a heart attack at the Macmillan family estate at Birch Grove, West Sussex, in 1966. Her husband, who was created Earl of Stockton in 1984, outlived her by 20 years.