Page "Asopus" Paragraph 23

Both Apollodrus and Diodorus also bring in two sons of Asopus, the first named Ismenus and the second named Pelagon ( by Apollodorus ) or Pelasgus ( by Diodorus ).

Nothing else has survived about this Pelagon.

Of Isemenus, Diodorus states only that he emigrated to Boeotia and settled near the Boeotian river which was afterwards called Ismenus from his name.