Acarnan, eponym of Acarnania. He was the son, with Amphoterus, of Callirhoë (the daughter of Acheloüs) and Alcmaeon (1) (who had settled in the Achelous floodplain to escape the Erinyes). Later, when Alcmaeon was murdered by the sons of Phegeus, Callirhoë begged Zeus to age her sons prematurely so they might avenge their father's murder. Their vengeance exacted, Acarnan and Amphoterus gathered settlers and inhabited Acarnania (Thuc. 2. 102; Apollod. 3. 91–3; Strabo 10. 2. 6).