What was Thoas's grandfather punished for?
Thoas (king of Corinth) In Greek mythology, Thoas was a son of Ornytion and a grandson of Sisyphus. According to Pausanias, Thoas remained in Corinth, succeeding his father as its ruler, while his brother Phocus led a colony to Tithorea. Thoas was the father of Damophon, Damophon of Propodas, and Propodas of Doridas and Hyantidas. During the reign of the latter two, Corinth was seized by the Dorians under the command of Aletes, son of Hippotes. The brothers handed control of Corinth to him and were allowed to remain in the city, while the rest of the people were expelled.
Herakles (Euripides) Herakles (Ancient Greek: Ἡρακλῆς μαινόμενος , "Hēraklēs Mainomenos", also known as "Hercules Furens ") is an Athenian tragedy by Euripides that was first performed c. 416 BCE. While Herakles is in the underworld obtaining Cerberus for one of his labours, his father Amphitryon, wife Megara, and children are sentenced to death in Thebes by Lycus. Herakles arrives in time to save them, though the goddesses Iris and Madness (personified) cause him to kill his wife and children in a frenzy. It is the second of two surviving tragedies by Euripides where the family of Herakles are suppliants (the first being "Herakles' Children"). It was first performed at the City Dionysia festival.