Victor succeeded his uncle as 9th
Duke of Devonshire in 1908, whereupon Evelyn became the Duchess of Devonshire. The Devonshires were one of the country's richest families, thought by some to have more wealth than the royal family. The Duchess was to oversee four large estates in England and one Irish castle. With her new position, she oversaw the reorganisation of the Devonshire estates. The Duchess strictly adhered to etiquette and her position, being characterised by a brother-in-law as "accustomed to authority." She was known for her abrasive personality; her
granddaughter-in-law wrote that she "was not altogether easy to get on with," whilst another referred to her as "an unpleasant woman." Her husband's biographer described her as "cold, authoritarian, and frugal," and a servant recalled that "she wouldn't speak to you unless she wanted something, and I can't say she ever thanked you either." In 1909, the Duchess founded the
Derbyshire branch of the
Red Cross and became its first president. She was appointed
Mistress of the Robes to the newly crowned
Queen Mary in 1910. In 1916, the Duke accepted the appointment of Governor General of Canada, and his wife relinquished her position to accompany him, along with six of their children. While in Canada, their daughter
Lady Dorothy met
Harold Macmillan, the future prime minister. While the Duke was delighted with the match, the Duchess was unhappy that Macmillan, though wealthy, was the member of a mere tradesmen family. She favoured a match between her daughter and the
heir to the Duke of Buccleuch instead. Nevertheless, Dorothy and Macmillan were married in April 1920. The Duke of Devonshire's tenure in Canada ended in 1921, and the Duchess resumed her role as Mistress of the Robes to Queen Mary, holding the appointment from 1921 to the latter's death in 1953. Queen Mary invested the Duchess as a
Dame Grand Cross of The Royal Victorian Order in May 1937. ==Widowhood==