License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Jacob Neeffs. Plate 22: Emperor Charles V, victory at Pavia; from Guillielmus Becanus's 'Serenissimi Principis Ferdinandi, Hispaniarum Infantis...', 1636. The Metropolitan Museum of Art.