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. Plate 2: Campo Vaccino, a buffalo and two shepherds in center, the Fontanone, various animals and people in the background, from "Roman landscapes and ruins" (Paysages et ruines de Rome), ca. 1643–48. The Metropolitan Museum of Art.