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).
Cornelis Galle I after Erasmus Quellinus II after Sir Peter Paul Rubens. Title Page for Hubert Goltzius's Icones Imperatorvm Romanorvm (Opera Omnia, V), 1645. National Gallery of Art, Washington.