In Greek mythology, Agasthenes (Ancient Greek Ἀγασθένης) is the son of Augeas and his successor in the kingdom of Elis. After Augeas' death the government was shared among Amphimachus, Thalpius, and Agasthenes. With Peloris he fathered Polyxenus, one of Helen's suitors, who reunified the kingdom after returning from Troy.
Adapted from Wikipedia, "Agasthenes" · CC BY-SA 4.0
I.Heir of Augeas
Homer names Agasthenes as father of Polyxenus, captain of ten Epeian ships in the Catalogue. Pausanias recounts that when Phyleus returned to Dulichium and Augeas died old, Elis devolved on Agasthenes together with Amphimachus and Thalpius of the Actorid line.
Polyxenus later reunited the realm after Troy. The atlas id agasthenes-epeian is this Elean king — distinct from any other Agasthenes name-stems.