License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Anne Claude Philippe de Tubières, comte de Caylus. Grotesques: detail of the stucco reliefs decorating the Colosseum in Rome, with a winged figure hovering between two pairs of columns, ca. 1729. The Metropolitan Museum of Art.