License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Jacques Androuet Du Cerceau. Interior View of the Court Yard and Frontal View of the Defense Mechanism at Chateau d'Anet, from "Les plus excellents bastiments de France", 1607. The Metropolitan Museum of Art.