Well it depends on which Chione you are talking about. There are many in Greek Mythology.
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Poseidon's greatest enemy was his father, Cronus.
The reason they were enemies is because of the war that Poseidon started.
Zeus is Poseidon's enemy and brother.
Poseidon
Chione cancellata was created in 1767.
athena is his enemy
Yes
Odysseus blinded Poseidon's son Polyphemus.Odysseus did not consider Poseidon his enemy, as it would be foolhardy for a mortal to be an enemy to any god. However, Poseidon was a wrathful god who was punishing Odysseus for blinding his son, the cyclops Polyphemus, by piercing his only eye. As a result, Poseidon hampered Odysseus' efforts to get home, giving him trials.Eventually Odysseus builds a shrine to Poseidon to appease the god, although the actual event is takes place after the events in the Odyssey.Poseidon is not a traditional enemy, in the normal sense of 'enemy'.
His rival is Athena.But probably his enemy is Oceanus, the titan of the sea.
Trojan warriors
Poseidon was Athena's enemy:(
Poseidon