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 34: King Ferdinand as Neptune, seated on a whale at center, with putti atop two small fish on either side; from Guillielmus Becanus's 'Serenissimi Principis Ferdinandi, Hispaniarum Infantis...', 1636. The Metropolitan Museum of Art.