That the topic is Polyneices is the connection between the Parados and Antigone's and Ismene's conversation in "Antigone" by Sophocles (495 B.C.E. - 405 B.C.E.).
Specifically, sister Theban Princesses Antigone and Ismene discuss the unburied status of their brother Polyneices' body. It distresses Antigone, but not Ismene, that their uncle King Creon denies their brother's body god-given rights of all Thebans to below ground burials. The chorus then enters and offers their biased justification for Creon's denial of Polyneices' rights. The members point the blame at Polyneices as a traitor who joins up with Argives to attack his own hometown of Thebes. They reveal just what they want to since Polyneices in fact is in the right for being denied his legitimate royal claim by the usurpers, his own twin brother Eteocles and his uncle Creon.