Keywords: Duke of Portland by Pratt.jpg otherdate c 1774 Oil on canvas cm 76 3 63 2 Institution National Gallery of Art Gift of Clarence Van Dyke Tiers http //www nga gov/fcgi-bin/timage_f object 3159 image 3381 c other versions <gallery>01-Bentinck William Henry Cavendish 3rd Duke of Portland c 1774 jpg</gallery> PD-old-100 Matthew Pratt Bentinck William Henry Cavendish 18th-century portrait paintings in the National Gallery of Art 1774c American paintings in the National Gallery of Art William Cavendish-Bentinck 3rd Duke of Portland Pratt 1774 oil on canvas paintings in the United States Portrait 1774 portrait paintings Male 18th-century oil portraits of sitting men at half length 1774c 18th-century profile portrait paintings of men 1774c Jabots in art 1774c Three-quarter view portrait paintings of men facing right |