Duchess of Grafton
Duchess of Grafton is the title given to the wife of the Duke of Grafton. Women who have held the title include:

Isabella FitzRoy, Duchess of Grafton (1668-1723)
Anne FitzPatrick, Countess of Upper Ossory (1737-1804), who was duchess from 1757 until her divorce in 1769.
Fortune FitzRoy, Duchess of Grafton (born 1920)

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