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. Campo Vaccino, a buffalo and two shepherds in center, the Fontanone to right in the middle ground, various animals and people in the background, plate 2 from "Roman landscapes and ruins" (Paysages et ruines de Rome), ca. 1646. The Metropolitan Museum of Art.