Phaedra or Hippolytus by Seneca the Younger is a Latin adaptation of Euripides' Hippolytus. Both plays tell the story of Phaedra, the wife of King Theseus and her passion for her step-son Hippolytus. Seneca's portrays the action more directly than Euripides, relying less on intermediaries and letters at key plot points.
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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: Phaedra. Latin text. HTML format.
Loebulus. L062N - Tragedies I: Hercules Furens. Troades. Medea. Hippolytus. Oedipus. Public domain Loeb edition in Latin with facing English translation by Frank Justus Miller. Multiple formats.
Theoi: Phaedra, translated by Frank Justus Miller. HTML format.
Wikisource: Hippolytus or Phaedra, translated by Frank Justus Miller. HTML and other formats.
BBC In Our Time: Seneca the Younger - Radio discussion with Melvyn Bragg, Mary Beard, Catherine Edwards and Alessandro Schiesaro.
Literature and History: Love Means Sin - Seneca's Phaedra, podcast by Doug Metzger.
The Great Conversation: Further reading at Tom's Learning Notes
Latin Resources: Online materials for learning Latin.