The Nemean lion was killed by the son of which Greek gods?
Heracles Heracles ( ; Ancient Greek: Ἡρακλῆς , "Hēraklēs", from "Hēra", "Hera"), born Alcaeus (Ἀλκαῖος , "Alkaios") or Alcides (Ἀλκείδης , "Alkeidēs"), was a divine hero in Greek mythology, the son of Zeus and Alcmene, foster son of Amphitryon and great-grandson and half-brother (as they are both sired by the god Zeus) of Perseus. He was the greatest of the Greek heroes, a paragon of masculinity, the ancestor of royal clans who claimed to be Heracleidae (Ἡρακλεῖδαι ), and a champion of the Olympian order against chthonic monsters. In Rome and the modern West, he is known as Hercules, with whom the later Roman emperors, in particular Commodus and Maximian, often identified themselves. The Romans adopted the Greek version of his life and works essentially unchanged, but added anecdotal detail of their own, some of it linking the hero with the geography of the Central Mediterranean. Details of his cult were adapted to Rome as well.
Megareus of Onchestus In Greek mythology, Megareus of Onchestus was king of Onchestus in Boeotia. He was either son of Poseidon and Oenope, daughter of Epopeus, or of Onchestus (eponym of their kingdom), or of Apollo, or of Aegeus, or of Hippomenes. He came with his army to the assistance of Nisos, husband of his sister Abrota, against Minos. In one version, he died in the battle, and the city of Nisa (Nisos' domain) was renamed Megara in his honor; in another, he married Iphinoe, daughter of Nisos, and succeeded to his father-in-law's power over Megara. His children by Iphinoe were Evippus, Timalcus, and Evaechme; he also had a son Hippomenes by Merope. With the aid of the god Apollo, Alcathous killed the Cithaeronian lion, for which Megareus gave him his daughter Euaechme as wife. He subsequently made Alcathous his successor, because his own sons did not outlive him: Evippus was killed by the lion, and Timalcus was slain by Theseus, having joined the Dioscuri in the campaign against him.