License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Pieter de Jode II. Plate 10: The King of Hungary and Ferdinand on horseback; from Guillielmus Becanus's 'Serenissimi Principis Ferdinandi, Hispaniarum Infantis...', 1636. The Metropolitan Museum of Art.