Yes it is part of Orestia. Here is a site which will clarify your question.
http://www.is.uwp.edu/academic/english/canary/atreus.html
In which work did Aegisthus kill Atreus? I think it's "House of Atreus" by Aeschylus but I'm not sure exactly what that is. Is it part of Oresteia??
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