The eternal sleeper Endymion had a son Aitolos in Elis, who, having there killed a man named Apis, fled the country (as was usual for homicides), and found refuge in the land of the Kouretes. His hosts in that place were three sons of Apollo and Phthia: Doros, Laodokos, and Polypoites. But Aitolos ungratefully slew all three, took their country for his own, and called it Aitolia in honour of himself. The later ruinous internecine warfare between the two Aitolian city-states Pleuron and Kalydon (founded by Aitolos’ two sons of that name) is, like the troubles of the Pelopid dynasty in Argolis, an instance in ancient Greek mythology of sang impur or “the sins of the fathers visited upon the sons” for many generations.
Penelope in Odyssey 16 justly castigates Antinoös for similar ingratitude and murderous ambition in Ithake.