License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Philip Henry Delamotte. [Statue of a Horse; Roman Court, Portrait Busts of Emperors; Doorway of Roman Court, Flanked by Portrait Bust of Nero; Greek Court of Philosophers, Statesmen, and Generals], ca. 1859. The Metropolitan Museum of Art.