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 149: Aesculapius as a Serpent, Among the Romans (AEsculapius in anguem conversus Roman advehitur), from Ovid's "Metamorphoses", 1606. The Metropolitan Museum of Art.