The —, trilogy of plays by Aeschylus (8)

I believe the answer is:

oresteia

(Other definitions for oresteia that I've seen before include "Play trilogy by Aeschylus, see a riot (anag.)" , "three tragedies for Aeschylus" , "Greek plays" , "Aeschylus's play trilogy" .)

I've seen this clue in The Mirror.

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