It has been speculated that the white text that was painted onto the painting by Jan Asselijn known as The Threatened Swan was done in this period. The painting, which supposedly symbolizes Johan de Witt as a white swan protecting his country's eggs from an Orangist dog, was purchased for the Nationale Konst-Gallery in The Hague in 1800 based on its allegorical reference, but only later did visitors point out that the painter had died long before the murder of the De Witt brothers took place.