Mary Montagu, Countess of Cardigan

Mary Montagu, Duchess of Montagu, known as Countess of Cardigan between 1730 and 1749, was the wife of George Brudenell, 4th Earl of Cardigan. She was the daughter of John Montagu, 2nd Duke of Montagu, on whose death in 1749 her husband inherited the family estates and took the surname "Montagu". Her mother was Lady Mary Churchill, daughter of John Churchill, 1st Duke of Marlborough. In 1766, her husband the earl was made a duke, reviving the titles that had become extinct as a result of his father-in-law's death without a male heir.