License, verbatimPD
The National Gallery of Art: open access image with no usage restrictions under the NGA's open access policy (openaccess=1 in the Gallery's published_images dataset).
Francisco Goya. Modo con que los antiguos Espanoles cazaban los toros a caballo en el campo (The Way in which the Ancient Spaniards Hunted Bulls on Horseback in the Open Country), in or before 1816. National Gallery of Art, Washington.