License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Pietro Testa. The Prodigal Son Seated on a Couch Being Served Wine, Revelers in the Background, a Monkey Wearing a Collar and Chain in the lower left, ca. 1645. The Metropolitan Museum of Art.