Seven Against Thebes (Greek: Ἑπτὰ ἐπὶ Θήβας, Hepta epi Thēbas; Latin: Septem contra Thebas) is a tragedy by Aeschylus, originally produced in 467 BC as the conclusion of a trilogy including the lost plays Laius and Oedipus.
The drama centres on Oedipus's sons Eteocles, King of Thebes, and his exiled brother Polyneices, who is leading an Argive army against the city. Eteocles dispatches Theban champions to the city's gates, each of which is being attacked by one of seven heroes: Adrastus, Tydeus, Parthenopaeus, Capaneus, Hippomedon, Amphariaus, and Polyneices himslef, who is confronted by the king in person.
In its original version, the play ended with mourning for the two brothers after they slay each other in single combat. The text was modified some fifty years later to set the scene for the events of Sophocles' Antigone.
Gutenberg: Four Plays of Aeschylus; The Suppliant Maidens, The Persians, The Seven against Thebes, The Prometheus Bound, translated by E.D.A. Morshead. Multiple formats.
Internet Archive: The Plays of Aeschylus, translated by Walter Headlam and C.E.S. Headlam. Multiple formats.
Internet Archive: The Seven Against Thebes, translated by Edwyn Bevan. Multiple formats.
Internet Classics Archive: The Seven Against Thebes, translated by E.D.A. Morshead. HTML and TXT formats.
Loebulus. L145 - Aeschylus -- Suppliant Maidens. Persians. Prometheus. Seven Against Thebes. PDF of public domain Loeb edition in Greek and English.
University of Adelaide (Internet Archive): Seven Against Thebes, translated by E.D.A. Morshead. Multiple formats.
Perseus: Seven Against Thebes, translated by Herbert Weir Smith. HTML and XML format.
History of Ancient Greece: Early Tragedy and Aeschylus, podcast by Ryan Stitt.
Librivox: Seven Against Thebes - public domain audiobooks.
Literature and History: Episode 26 - Ancient Greek Theater. Podcast.
The Great Conversation: Further reading at Tom's Learning Notes
Aristotle: The Poetics.
A.E. Haigh: The Tragic Drama of the Greeks (1896).
Ancient Greek resources: Learn to read Greek classics in the original.
Bloom's Western Canon: Seven Against Thebes is listed.