The Oedipus of Seneca the Younger is a Latin adaptation of Sophocles' Oedipus Rex. As with many of Seneca's plays, the action is portrayed more directly than in the Greek model. Notably, in this instance, Jocasta's suicide takes place on stage, rather than being discovered after the fact as in Sophocles.
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Free online texts
Internet Archive: Tragedies I: Hercules Furens. Troades. Medea. Hippolytus. Oedipus. PDF of public domain Loeb edition in Latin with facing English translation by Frank Justus Miller.
Latin Library: Oedipus. Latin text. HTML format.
Loebulus: L062N - Tragedies I: Hercules Furens. Troades. Medea. Hippolytus. Oedipus. PDF of public domain Loeb edition in Latin and English.
Theoi: Oedipus, translated by Frank Justus Miller. HTML format.
BBC In Our Time: Seneca the Younger - Radio discussion with Melvyn Bragg, Mary Beard, Catherine Edwards and Alessandro Schiesaro.
Wikipedia: Oedipus (Seneca)
The Great Conversation: Further reading at Tom's Learning Notes
Latin Resources: Online materials for learning Latin.
Sophocles: Oedipus Rex