Eurystheus ordered Hercules, as an eleventh labour, to fetch golden
apples from the Hesperides... So journeying he came to the river Echedorus. And
Cycnus, son of Ares and Pyrene, challenged him to single combat. Ares championed
the cause of Cycnus and marshalled the combat, but a thunderbolt was hurled between
the two and parted the combatants.
Compare Hyginus, Fab. 31, who describes the intervention of Mars (Ares) on the side of his son Cycnus, and the fall of the thunderbolt which parted the combatants; yet he says that Herakles killed Cycnus. This combat, which, according to Apollodorus, ended indecisively, was supposed to have been fought in Macedonia, for the Echedorus was a Macedonian river (Hdt. 7.124, Hdt. 7.127). Accordingly we must distinguish this contest from another and more famous fight which Herakles fought with another son of Ares, also called Cycnus, near Pagasae in Thessaly. See Apollod. 2.7.7, with the note. Apparently Hyginus confused the two combats.
Cycnus, a son of Ares and Pyrene, was likewise killed by Heracles in single combat (Apollod. ii. 5.11; Schol. ad Pind. Ol. xi. 19). At his death he was changed by his father Ares into a swan. (Eustath. ad Hom. p. 254.)
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