According to the story, Areion was born from the union of Demeter, the Greek goddess of crops and fertility, and Poseidon, the Greek god of the oceans. Chased by Poseidon, furious Demeter assumed the form of a mare, but Poseidon merely followed suit.
- Though different accounts of Areion's parentage exist, the version written by Pausanias in his Description of Greece is used in Assassin's Creed: Odyssey.
- One of The Lost Tales of Greece, Old Flames Burn Brighter, features an Arkadian boy named Arion; his name is a variant spelling of the horse's name.
- Assassin's Creed: Odyssey (mentioned only)