License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Adriaen Collaert. Plate 9: equestrian statue of Vitellius, seen three-quarters to the left, with his death scene in the background at right, his body being thrown into the Tiber at upper right, from 'Roman Emperors on Horseback', ca. 1587–89. The Metropolitan Museum of Art.