In Greek mythology, Electryon was a king of Tiryns and Mycenae (or of Medea in Argolis), a son of Perseus and Andromeda. He married Anaxo, the daughter of his brother Alcaeus, and was the father of Alcmene — making him, through her, the maternal grandfather of Heracles. He died at the hands of his nephew Amphitryon, after which Sthenelus seized the Mycenaean throne and drove Amphitryon into exile.
Adapted from Wikipedia, "Electryon" · CC BY-SA 4.0
I.Family
Electryon was a descendant of Perseus and Andromeda, which made him a brother to Perses, Alcaeus, Heleus, Mestor, Sthenelus, Cynurus, Gorgophone, and Autochthe.
His most common spouse was Anaxo, the daughter of his brother Alcaeus and sister of Amphitryon, though some versions identify his wife instead as Eurydice, daughter of Pelops.
His children included a daughter named Alcmena and numerous sons: Stratobates, Gorgophonus, Phylonomus, Celaeneus, Amphimachus, Lysinomus, Chirimachus, Anactor, and Archelaus. He also fathered an illegitimate son, Licymnius, with Midea, a Phrygian woman.
II.Mythology
The six sons of Pterelaus, king of the Taphians and descendants of Electryon's brother Mestor, journeyed to Mycenae demanding a share of the kingdom. When Electryon refused, they seized his cattle. His sons engaged the raiders in battle, and only Licymnius and Everes survived, on opposite sides. Everes then sold the captured cattle to Polyxenus of Elis.
III.Death
Amphitryon, Electryon's nephew and the betrothed of his daughter Alcmena, purchased the cattle and returned them. In the course of this, he fatally struck Electryon with his club. One tradition presents the killing as an accident, while an alternate tradition suggests that Amphitryon killed Electryon in anger over the cattle.
After Electryon's death, Sthenelus seized the Mycenaean throne, charged Amphitryon with murder, and exiled him from the kingdom.