Ferdinand of Austria on Horseback. Paulus Pontius (Flemish, 1603-1658)?after Peter Paul Rubens (Flemish, 1577-1640). Date: 1636-1646. Dimensions: 450 ? 323 mm (image); 483 ? 327 mm (plate); 487 ? 332 mm (sheet). Engraving in black on ivory laid paper