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In Greek mythology, Eteocles was one of the twin sons of Oedipus, the cursed king of Thebes. After Oedipus's fall, Eteocles and his brother, Polyneices, failed to agree on succession to the throne. They decided to rule in alternate years, with Eteocles ruling first.12

When Eteocles refused to relinquish the throne to Polyneices, Polyneices fled to Argos. He gathered an army of seven champions, including himself, to attack Thebes. During the assault on the city's seven gates, both Eteocles and Polyneices killed each other, fulfilling their father's curse. This conflict is famously depicted in the story of the "Seven Against Thebes".1

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2 Britannica Sources
  1. Seven Against Thebes
  2. Oedipus

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