Margaret Cavendish (Harley), Duchess of Portland; William Bentinck, 2nd Duke of Portland; Lady Mary Wortley Montagu by George Vertue, Christian Friedrich Zincke, 1739

Margaret cavendish (harley), duchess of portland; william bentinck, 2nd duke of portland; lady mary wortley montagu, by george vertue (died 1756). Date: 1739. Dimensions: height: 233 mm (9.17 in); width: 332 mm (13.07 in). Medium: engraving. Collection: National Portrait Gallery.