“Quos ego” (Neptune calms the waves after a tempest), Theodor van Thulden after Peter Paul Rubens, copperplate engraving, 1642; from Casperius Gevartius, Pompa introitus... Ferdinandi Austriaci... in urbem Antverpiam (Antwerp, 1641-42).
Another print by Thulden after Rubens featuring King Ferdinand (Harvard Art Museums)