 She implies that the infanticide of Itys did not appear in the Tereus myth until Sophocles' play and that it was introduced because of what was borrowed from Euripides.It is possible that social and political themes have woven their way into the story as a contrast between Athenians who believed themselves to be the hegemonic power in Greece and the more civilized of the Greek peoples, and the Thracians who were considered to be a "barbaric race".It is possible that these elements were woven into Sophocles' play "Tereus" and other works of the period.