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. "Bahram Gur Pins the Coupling Onagers", Folio 568r from the Shahnama (Book of Kings) of Shah Tahmasp, ca. 1530–35. The Metropolitan Museum of Art.