License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Johann Heinrich Lips. Hercules Slays Diomedes and his Flesh-Eating Mares (Apollodorus, II, 5, 8 and Quintus Smyrnaeus, VI, 247-250), 1806. The Metropolitan Museum of Art.