Oncius

In Greek mythology, Oncius^{[pronunciation?]} (Ancient Greek: Ὄγκιος, romanized: Ónkios, lit. 'case for arrowheads') or Oncus (Ancient Greek: Ὄγκος, romanized: Ónkos, lit. 'point of an arrow')^[1] was a son of Apollo and a ruler over Ónkeion (Ὄγκειον), a region of Arcadia adjacent to Thelpusa,^[2]^[3] as well as eponym of a city Oncae.^[4] 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 Elis.^[5]

^ Liddell Scott s.v. ὄγκιον & ὄγκος (Α)
^ Pausanias, Description of Greece, 8. 25. 4
^ Stephanus of Byzantium s. v. Onkeion
^ Etymologicum Magnum, 613. 43
^ Pausanias, Description of Greece, 8. 25. 5 & 10

[1] Liddell Scott s.v. ὄγκιον & ὄγκος (Α)

[2] Pausanias, Description of Greece, 8. 25. 4

[3] Stephanus of Byzantium s. v. Onkeion

[4] Etymologicum Magnum, 613. 43

[5] Pausanias, Description of Greece, 8. 25. 5 & 10

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