Who killed a whole city of men to avenge their sister's honor?

The character who killed a whole city of men to avenge their sister's honor is Orestes from Greek mythology. After his sister, Electra, was murdered by their mother, Clytemnestra, and her lover, Aegisthus, Orestes sought revenge. He killed both Clytemnestra and Aegisthus, and this act is often seen as part of a larger cycle of vengeance within the House of Atreus. Orestes' actions are pivotal in the themes of justice and revenge in ancient Greek tragedy.