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. Horseman in center facing left speaking to a man on foot, infantry troops in a line in the background, from "Various cavalry exercises" (Diverses exercices de cavalerie), ca. 1642–45. The Metropolitan Museum of Art.