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 66: Cycnus and Hyrie (Cygnus in olorem Hiere in stagnum vertuntur), from Ovid's 'Metamorphoses', 1606. The Metropolitan Museum of Art.