License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Antonio Tempesta. Hercules and the Mares of Diomedes: Hercules grasps the bridle of a rearing horse, a second horse tramples a figure in at right, from "The Labors of Hercules", 1608. The Metropolitan Museum of Art.