License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Antonio Tempesta. Plate 84: Hercules Throwing Lichas into the Sea (Lernaei muneris gerulum in Euboicum mare praecipitat Hercules), from Ovid's 'Metamorphoses', 1606. The Metropolitan Museum of Art.