In some metaphysical mythology, Nemesis produced the egg from which hatched two sets of twins: Helen of Troy and Clytemnestra , and the Dioscuri , Castor (Kástor) and Polydeukes (Polydeúkes). Hesiod states: "Also deadly Nyx bore Nemesis to afflict mortal men." ( Theogony , 223, though perhaps an interpolated line). Nemesis