Paeon (son of Endymion)

Paeon (Ancient Greek: Παίων, gen.: Παίονος) in Greek mythology was a son of Endymion, king of Elis, and brother of Epeius, Aetolus, and Eurycyda; from whom the district of Paeonia, on the Axius river in Macedonia, was believed to have derived its name.
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References

Pausanias, Description of Greece. W. H. S. Jones (translator). Loeb Classical Library. Cambridge, MA: Harvard University Press; London, William Heinemann Ltd. (1918). Vol. 1. Books I–II: ISBN 0-674-99104-4.
Smith, William, A dictionary of Greek and Roman biography and mythology. London. Online at Perseus

 This article incorporates text from a publication now in the public domain: Smith, William, ed. (1870). "article name needed". Dictionary of Greek and Roman Biography and Mythology. ...