Gwendolen Florence Mary Guinness, Countess of Iveagh , ne Lady Gwendolen Florence Mary Onslow, known as Lady Gwendolen Guinness from 1903 to 1919 and Viscountess Elveden from 1919 to 1927, was a Conservative politician in the United Kingdom, and, by marriage, a member of the AngloIrish Guinness brewing dynasty.
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Source: Wikipedia