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In page Princess Alexandra, 2nd Duchess of Fife:

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Although Alexandra was born fifth in line of succession to the British throne, she was not entitled to the title of "Princess" or the style of "Her Royal Highness" because she was a female-line granddaughter of the reigning monarch. Instead, as the daughter of a duke, she was styled Lady Alexandra Duff.[5] Uniquely among British royals, Alexandra and her sister were descended from both King William IV —through his mistress, Dorothea Jordan—and from his niece, Queen Victoria, who inherited the throne due to William IV's lack of legitimate heirs.[citation needed]