Frances Seymour, Duchess of Somerset numerous descendants include Queen Elizabeth The Queen Mother (and therefore The Queen and all of her blood descendants), Diana, Princess of Wales, and Sarah, Duchess of York. Frances Seymour, Duchess of Somerset Frances Seymour, Duchess of Somerset ("née" Devereux; 30 September 1599 – 24 April 1674), was an English noblewoman who lived during the reigns of Elizabeth I, James I, Charles I and Charles II. Her father was Robert Devereux, 2nd Earl of Essex, Elizabeth I's favourite who was executed for treason in 1601. She was the second wife of William Seymour, 2nd Duke of Somerset, and the mother of
Sarah Churchill, Duchess of Marlborough offer financially, as his estates were deeply in debt. Sarah had a rival for Churchill in Catherine Sedley, a wealthy mistress of James II and the choice of Churchill's father, Sir Winston Churchill, who was anxious to restore the family's fortune. John may have hoped to take Sarah as a mistress in place of the Duchess of Cleveland, who had recently departed for France, but surviving letters from Sarah to John show her unwillingness to assume that role. In 1677, Sarah's brother Ralph died, and she and her sister, Frances, became co-heirs of the Jennings estates in Hertfordshire and Kent.