On 22 April 1725, at Ashbridge, Buckinghamshire, Anne married her stepmother's brother, who had succeeded to the dukedom in 1711. A contemporary wrote that: "There resulted an wholly mix-up of relationships".[5] The marriage was not a success,[6] and the couple were childless. The duke was in financial difficulty, and died on 23 October 1732, aged 24, in Corunna, Spain, and Anne became Dowager Duchess, as the dukedom passed to her husband's brother.[7]
^G.E. Cokayne; with Vicary Gibbs, H.A. Doubleday, Geoffrey H. White, Duncan Warrand and Lord Howard de Walden, editors, The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant, new ed., 13 volumes in 14 (1910-1959; reprint in 6 volumes, Gloucester, U.K.: Alan Sutton Publishing, 2000), volume II, page 82.
^G.E. Cokayne; with Vicary Gibbs, H.A. Doubleday, Geoffrey H. White, Duncan Warrand and Lord Howard de Walden, editors, The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant, new ed., 13 volumes in 14 (1910-1959; reprint in 6 volumes, Gloucester, U.K.: Alan Sutton Publishing, 2000), volume II, page 314.