License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Stefano della Bella. A shepherd sleeping on the ground at right, three horses at left, other horses and various figures to right, the Baths of Diocletian in the background, plate 12 from "Roman landscapes and ruins" (Paysages et ruines de Rome), ca. 1646. The Metropolitan Museum of Art.