License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Abu'l Qasim Firdausi. "Nushirvan Receives Mihras, Envoy of Caesar", Folio from the First Small Shahnama (Book of Kings), ca. 1300–30. The Metropolitan Museum of Art.