The New International Encyclopædia/Portland, Duke of
PORTLAND, Duke of. An English title of nobility, borne by the Cavendish-Bentinck family since 1716, when it was conferred upon the heir of William Bentinck (1649-1709), first Earl of Portland, a Dutch general, the friend and adviser of William of Orange, whom he accompanied to England. The more distinguished members of the family have been Lord William Cavendish Bentinck, second son of the third Duke, and Lord William George Frederick Cavendish Bentinck, third son of the fourth Duke. See Bentinck.