License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Adamo (Ghisi) Scultori. Hercules and the Nemean Lion: Hercules grasps the shoulders and chest of the lion, which is viewed from the back, beside a rocky outcrop, ca. 1530–87. The Metropolitan Museum of Art.