Historical Context for Oresteia by Aeschylus
https://www.college.columbia.edu/core/content/historical-context-oresteia-aeschylus
An in-depth article about the historical context for Aechylus's Oresteia, produced and published by Columbia University.
The Curse of the House of Atreus
Background story on the events of the Oresteia. Gives details on how the curse came about and how it continues to affect the family of Agamemnon. Compiled by the Metropolitan Opera.