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. "Kai Khusrau is Discovered by Giv", Folio 210v from the Shahnama (Book of Kings) of Shah Tahmasp, ca. 1525–30. The Metropolitan Museum of Art.