License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Jacques Callot. Les Bergers Défendant leur Troupeau (The Shepherds Defending their Herd), plate 4 from "Lux Claustri ou La Lumière du Cloitre" (The Light of the Cloisters), 1625–31. The Metropolitan Museum of Art.