Simoeis was a river of the Trojan

Troy

Troy was a city, both factual and legendary, located in northwest Anatolia in what is now Turkey, southeast of the Dardanelles and beside Mount Ida...

 plain and the name of its god. Like other river-gods, Simoeis was the son of Oceanus

Oceanus

Oceanus ; , Ōkeanós) was a pseudo-geographical feature in classical antiquity, believed by the ancient Greeks and Romans to be the world-ocean, an enormous river encircling the world....

 and Tethys (mythology)

Tethys (mythology)

In Greek mythology, Tethys , daughter of Uranus and Gaia was an archaic Titaness and aquatic sea goddess, invoked in classical Greek poetry but not venerated in cult. Tethys was both sister and wife of Oceanus...

. Simoeis had two daughters who were married into the Trojan royal family. One daughter, Astyoche

Astyoche

The name Astyoche or Astyocheia was attributed to the following individuals in Greek mythology.*Daughter of the river god Simoeis, mother of Tros by Erichthonius....

, was married to Erichthonius

Erichthonius of Dardania

The mythical King Erichthonius of Dardania was the son of Dardanus or Darda, King of Dardania, and Batea,...

, and the other daughter, Hieromneme

Hieromneme

Hieromneme was a minor naiad of Asia Minor in Greek mythology. She was a daughter of the river-god Simoïs and the wife of Assaracus, by whom she bore Capys. Alternately, she was the daughter-in-law of Assaracus, wife of Capys and mother of Anchises....

 was the wife of Assaracus

Assaracus

In Greek mythology, Assaracus was the second son of Tros, King of Dardania. He inherited the throne when his elder brother Ilus preferred to reign instead over his newly founded city of Ilium . He married Hieromneme, daughter of Simoeis; others say his wife was Clytodora, daughter of Laomedon....

. When the gods took sides in the Trojan War

Trojan War

In Greek mythology, the Trojan War was waged against the city of Troy by the Achaeans after Paris of Troy took Helen from her husband Menelaus, the king of Sparta. The war is among the most important events in Greek mythology and was narrated in many works of Greek literature, including the Iliad...

, Simoeis supported the Trojans. Scamander

Scamander

In Greek mythology, Scamander was a river god, son of Oceanus and Tethys according to Hesiod. Scamander is also thought of as the river god, son of Zeus. By Idaea, he fathered King Teucer....

, another river who also supported the Trojans, called upon Simoeis for help in his battle against Achilles

Achilles

In Greek mythology, Achilles was a Greek hero of the Trojan War, the central character and the greatest warrior of Homer's Iliad.Plato named Achilles the handsomest of the heroes assembled against Troy....

:

Come to my aid with all speed, fill your streams
with water from your springs, stir up all your torrents,
stand high in a great wave, and rouse a mighty roar
of timbers and rocks, so we can stop this savage man
who in his strength is raging like the gods.

(Iliad

Iliad

The Iliad is an epic poem in dactylic hexameters, traditionally attributed to Homer. Set during the Trojan War, the ten-year siege of the city of Troy by a coalition of Greek states, it tells of the battles and events during the weeks of a quarrel between King Agamemnon and the warrior Achilles...

, 21.311-15). seks

Before Simoeis can respond, Hephaestus

Hephaestus

Hephaestus was a Greek god whose Roman equivalent was Vulcan. He is the son of Zeus and Hera, the King and Queen of the Gods - or else, according to some accounts, of Hera alone. He was the god of technology, blacksmiths, craftsmen, artisans, sculptors, metals, metallurgy, fire and volcanoes...

was able to save Achilles by subduing Scamander with flame.