10 Downing Street - Duke of Portland: Biography of William Bentinck, Duke of Portland, Prime Minister 1783; 1807-9.Catalogue of the Papers of William Henry Cavendish Bentinck, 3rd Duke of Portland: Notes on the Portland Collection, held at the University of Nottingham. Includes portraits of the Duke and his wife.The Fox-North Coalition: Article discussing Portland's first ministry. Includes links to related articles .