Aeschylus 
Agamemnon 

Agamemnon, King of Mycenae, comes home from the Trojan War. Waiting for Agamemnon is his wife, Queen Clytemnestra, who has been planning his murder. She desires his death to avenge the sacrifice of her daughter Iphigenia, to exterminate the only thing hindering her from commandeering the crown, and finally be able to publicly embrace her long-time-lover Aegisthus.
An astonishing play about vengeance and pride, Agamemnon is the first of the three parts of Oresteia Trilogy.