License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Lutf-'Ali Shirazi. Drawing of Sasanian rock relief: Ardashir I (r. A.D. 224-241) and the Zoroastrian divinity Ohrmazd [Ahura Mazda] at Naqsh-i Rustam, southern Iran, A.H. 1226/1812 CE. The Metropolitan Museum of Art.