In Greek mythology, Stymphalus (Ancient Greek: Στύμφαλος) was a king of Arcadia and a son of Elatus. He was the eponym of the town Stymphalus (modern Stymfalia) and of a spring near it. He is best remembered for his death: when Pelops could not defeat him in war, he killed Stymphalus by treachery and scattered his dismembered remains, a crime that brought infertility upon Greece until Aeacus prayed for relief.
Adapted from Wikipedia, "Stymphalus (son of Elatus)" · CC BY-SA 4.0
I.Family
Stymphalus was one of the sons of Elatus and Laodice, alongside his brothers Pereus, Aepytus, Ischys and Cyllen.
His own offspring included the sons Agamedes, Gortys and Agelaus, the latter being the father of Phalanthus. Stymphalus also had a daughter, Parthenope, who became the mother of Everes by Heracles.
II.Mythology
Stymphalus was treacherously killed by Pelops. Being unable to defeat him in war, Pelops pretended to establish friendship with him, only to approach and slay the unsuspecting king; he then cut off his limbs and scattered them around.
As punishment for Pelops' crime, the gods made Greece suffer from infertility, and the affliction lasted until the pious Aeacus was asked to pray for relief.
III.Eponymy and the Stymphalides
Stymphalus gave his name to the Arcadian town of Stymphalus (now Stymfalia) and to a spring near it.
According to a scholion on Apollonius of Rhodes' Argonautica, the Greek historian Mnaseas considered a Stymphalus and a woman named Ornis (literally 'bird') to be the parents of a set of daughters, the Stymphalides. These daughters were killed by Heracles because they had denied him hospitality while receiving the Molionidae.