Sangarius (Ancient Greek Σαγγάριος) is the Phrygian river-god who personifies the Sangarius (modern Sakarya) in northwestern Asia Minor. Hesiod numbers him among the sons of Oceanus and Tethys; mythographers make him father or grandfather of Hecuba and, in other strands, ancestor of Attis through Nana and father of Nicaea by Cybele.
Adapted from Wikipedia, "Sangarius (mythology)" · CC BY-SA 4.0
I.Genealogy
In the Theogony Sangarius is an Oceanid river-son of Oceanus and Tethys. Apollodorus makes him husband of Metope and father of Hecuba; other notes name the naiad Evagora as mother, or give him a daughter Eunoë who bears Hecabe to King Dymas.
Ovid's Fasti connects him with Nana and thus with Attis. Nonnus has him father Nicaea by Cybele; other children in the tradition include Sagaritis and Ocyrrhoe.
II.Mythic geography
Homer's Iliad camps Trojan allies beside the Sangarius, tying the river to the Anatolian hinterland of Priam's world. The god and the stream are the same mythic fact: a major Phrygian watercourse on the road between the Aegean and the Anatolian plateau.
The atlas id sangarius is this river-god. He is not a mortal king or a separate city eponym.