Frances Vane, Marchioness of Londonderry

Frances Anne Vane, Marchioness of Londonderry was a wealthy English heiress and noblewoman. She was the daughter of Sir Henry VaneTempest, 2nd Baronet and the second wife of Charles Vane, 3rd Marquess of Londonderry. Through her daughter, Lady Frances Vane, wife of John Churchill, 7th Duke of Marlborough, she was the greatgrandmother of Sir Winston Churchill.

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Source: Wikipedia