(Ὄγκος), a son of Apollo, and founder of Onceium in Arcadia. Demeter, after being me tamorphosed ilto a horse, mixed among his herds, and gave him the horse Arion, of which she was the mother by Poseidon. (Paus. 8.25.4, &c.; comp. Step. Byz. s. v.)
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890