Arion in Myths and Stories
In the myth of HERACLES, Heracles takes Arion from Oncus, a son of Apollo who raised horses in a grove near the ocean. Demeter had been hiding there from Poseidon but Poseidon found her and sired Arion. Arion then ran with the herd.
Having obtained Arion from Oncus, Heracles then rode Arion during the war against the Eleans. Because of Arion, Heracles did win that war. Afterward Heracles gave Arion to Adrastus, King of Argos, who over time became the immortal horse’s most famous owner.
Arion intervened on behalf of Adrastus during the defeat of the Argives, making Adrastus the only Argive leader to survive. During this same battle the brothers Eteocles and Polynices killed each other over who would claim the throne at Thebes.