License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Giovanni Francesco Romanelli. One Half of a Design for a Frame of a Stage Proscenium, with a Figure of Justice at the Right, and the Barberini Arms in a Cartouche at the Top, 18th century. The Metropolitan Museum of Art.