 Shapiro detected its presence in Attic vase-painting between "ca" 565 and "ca" 480 BCE.A calyx-krater by Euphronios depicting the minor episode of Heracles' combat with the Thessalian brigand Kyknos occasioned Shapiro's examination of the myth's creative reworking among Attic vase-painters, who based their imagery of Heracle's shield on the literary model.The likelihood of both oral and literary transmission during the same time is noted by Janko (1986