The late-18th-century novelist Lady Elizabeth Foster, Duchess of Devonshire, was Wintour's great-great-great-grandmother, and Sir Augustus Vere Foster, the last Baronet of that name, was a granduncle.
Novelis akhir abad 18, Lady Elizabeth Foster, Duchess of Devonshire, adalah nenek moyang Wintour, dan Sir Augustus Vere Foster, Baronet terakhir dengan nama tersebut, adalah paman buyutnya.