Her Wikipedia article is here and includes this: "Helen Venetia Vincent, Viscountess D'Abernon (née Duncombe) (1866–1954) was a British peeress, socialite and diarist. Helen was the daughter of William Duncombe, 1st Earl of Feversham, of Ryedale and Mabel Violet Graham, born at their estate of Duncombe Park in Helmsley, North Yorkshire, England. She and her sister, Hermione, were renowned as leading beauties in their circle.
Helen married Sir Edgar Vincent, then a governor of the Imperial Ottoman Bank in Constantinople on September 24, 1890. In 1899 he was elected a Member of Parliament for Exeter. Lady Helen, in that period, was "the most celebrated hostess of her age and was 'by reason of her outstanding beauty, intelligence and charm, one of the most resplendent figures'. She was associated with 'the Souls,' a salon of noted intellectuals of the day..."