License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
John Bayly. Ruins of the Ancient Archiepiscopal Palace at Otford in Kent, from Edward Hasted's "The History and Topographical Survey of the County of Kent", vols. 1-3, 1777–90. The Metropolitan Museum of Art.