 Having achieved their objective, the Epigoni returned home, but not before they installed Thersander, son of the fallen prince Polynices (the instigator of the first Theban expedition), as the city's new ruler.As Diomedes and the Argive forces travelled home, an elderly King Adrastus died of grief upon learning that his son Aegialeus had perished in the battle; as such, Diomedes was left as the last of Adrastus' male descendants.That being so, upon returning home to Argos, Diomedes ascended to the throne.