NESTOS was a river-god of Bistonia in Thrake, north of Greece.
NESSUS (Nessos). The god of the river Nestus (also called Nessus or Nesus) in Thrace, is described as a son of Oceanus and Tethys. (Hes. Theog. 341.)
Source: Dictionary of Greek and Roman Biography and Mythology.
CLASSICAL LITERATURE QUOTES
Hesiod, Theogony 337 ff (trans. Evelyn-White) (Greek epic C8th or 7th B.C.) :
"Tethys bore to Okeanos (Oceanus) the swirling Potamoi (Rivers) . . . silver-swirling Akheloios (Achelous), Nessos and Rhodios [in a list of rivers]."
- Hesiod, Theogony - Greek Epic C8th - 7th B.C.