In Greek mythology, Sthenelus (Ancient Greek Σθένελος, "strong one") son of Capaneus and Evadne was an Epigonos who helped take Thebes and, in Homer's Iliad, the trusted charioteer and comrade of Diomedes at Troy. He boasts that their generation captured the city their fathers could not; Pausanias later assigns him a share of the divided Argive kingdom.
Adapted from Wikipedia, "Sthenelus" · CC BY-SA 4.0
I.Family and the Epigoni
Apollodorus and Hyginus place Sthenelus among the Epigoni, the sons who marched against Thebes to avenge the Seven. His father Capaneus had fallen in the first expedition; Sthenelus' success completes that generational revenge.
At Troy he stands beside Diomedes of Argos. Homer's Catalogue names him among the Argive leaders; in Book 4, when Agamemnon rebukes Diomedes by comparing him unfavourably to Tydeus, Sthenelus answers that they are better men than their fathers, for they took Thebes.
II.At Troy
Throughout the Iliad Sthenelus serves as Diomedes' companion and charioteer, tending the horses and sharing the glory of the Argive contingent. Later tradition keeps him among the Achaean heroes of the war generation.
Pausanias records that after the division of Argive power he inherited two thirds of the kingdom — a local succession detail beyond Homer.
III.Homonyms
This node (sthenelus-epigoni) is Capaneus' son, the Epigonos and Diomedes' comrade. He is not Sthenelus son of Perseus, king of Mycenae and father of Eurystheus (sthenelus-perseid); nor the Ligurian father of Cycnus; nor the Egyptian prince among Aegyptus' sons; nor Sthenelas of the Argive king-list (sthenelas-argive).