Lady Ann Juliet Dorothea Maud Tadgell (née Wentworth-Fitzwilliam; born 24 January 1935), previously Marchioness of Bristol, is a British heiress, race horse breeder, and landowner.
In 1948, Earl Fitzwilliam died in a plane crash in France with his lover, Kathleen Cavendish, Marchioness of Hartington, the widow of the heir to the Dukedom of Devonshire and a sister of the future U. S. President John F. Kennedy.
In 1960, Lady Juliet married Victor Hervey, 6th Marquess of Bristol, twenty years her senior, eighteen days after he inherited his title upon his father's death.
He had been divorced the previous year and, in his twenties, had been adjudicated a bankrupt, declared the "No.1 Playboy of Mayfair", and gaoled for drunken dare jewel robbery.
The couple had one child: After her second husband's death, in 1997, Lady Juliet married thirdly the architectural historian Christopher Tadgell and lives with him at her estate of Bourne Park, near Canterbury, Kent.