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).
Domenico di Polo di Angelo de' Vetri. Alessandro de' Medici, 1510-1537, 1st Duke of Florence 1532 [obverse], c. 1541. National Gallery of Art, Washington.