King Agamemnon of Mycenae was at the Trojan war. His wife,
Clytemnestra, cheated on him with Aegisthus. When Agamemnon came
back from the Trojan War, Clytemnestra and Aegistus teamed up and
chopped his head off. Orestes is Clytemnestra and Agamemnon's son.
He killed his mother, Clytemnestra to avenge his father.