Oncius

 ( Children Of Apollo ) 

In Greek mythology, Oncius () or Oncus ()Liddell Scott was a son of Apollo and a ruler over Onceium (Ὄγκειον), a region of Arcadia adjacent to Thelpusa,Pausanias, Description of Greece, 8. 25. 4Stephanus of Byzantium s. v. Onkeion as well as eponym of a city Oncae. Etymologicum Magnum, 613. 43 He owned a herd of horses, in which Demeter tried to hide from Poseidon's advances, changing herself into a mare. Poseidon did mate with her in the shape of a stallion, which resulted in the birth of the fantastic horse Arion. Oncius kept Arion and later gave him away to Heracles as the latter was starting a military campaign against ancient Elis.Pausanias, Description of Greece, 8. 25. 5 & 10

• Pausanias, Description of Greece with an English Translation by W.H.S. Jones, Litt.D., and H.A. Ormerod, M.A., in 4 Volumes. Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1918. . Online version at the Perseus Digital Library
• Pausanias, Graeciae Descriptio. 3 vols. Leipzig, Teubner. 1903. Greek text available at the Perseus Digital Library.
• Stephanus of Byzantium, Stephani Byzantii Ethnicorum quae supersunt, edited by August Meineike (1790-1870), published 1849. A few entries from this important ancient handbook of place names have been translated by Brady Kiesling. Online version at the Topos Text Project.