After an unknown drawing by Rubens of an unidentified marble sculpture (probably part of Rubens' antiquities collection). Some scholars identify the bust as a portrait of the historiographer Thucydides. This is one from a series of twelve plates by four different printmakers after antique marble portrait sculptures. Rubens completed the series in 1638 but it must have been started much earlier (as one of the engravers, Bolswert, died in 1633). The four engravers -- Paulus Pontius, Lucas Vorsterman I, Hans Witdoeck, and Boëtius Adamsz Bolswert -- were all employed by Rubens in his studio. The production of the prints was closely supervised by Rubens as attested by five retouched proof impressions. Only six of Rubens' preparatory drawings have survived.