Aigisthos -  The son of Thyestes, Aigisthos is a weak character in Aeschylus's version of the myth. In other versions of this story, Aigisthos, not Clytamnestra, concocts the plan to kill Agamemnon and then carries out the deed. In the Oresteia, however, Aigisthos is a rather minor character and is overshadowed by Clytamnestra, who takes him as her lover but who clearly wears the pants in the relationship. Aigisthos has his own reasons for hating Agamemnon, as it was Agamemnon's father Atreus who betrayed Aigisthos's father and killed his two brothers.