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 riding school, a horseman with sword jumping directed by another man with a sword in center, a man standing next to his horse to right, various horsemen, the school, and two dogs in the background, from "Varie Figure", ca. 1645. The Metropolitan Museum of Art.