License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Giovanni Jacopo Caraglio. Plate 15: Hercules standing in a niche, wearing a lion skin and holding a club, viewed from behind, with his head turned to the left, from "Mythological Gods and Goddesses", 1526. The Metropolitan Museum of Art.