Aeschylus 
Agamemnon of Aeschylus 

The Agamemnon of Aeschylus is the first play in The Trilogy of the Oresteia, which deals with the eternal problem of the evil act causing vengeance which wreaks more evil which must be avenged. Aeschylus declares that the new ruler in heaven, Zeus, heralds the end of this cycle and the beginning of hope. Zeus has suffered and sinned and grown wise, and thereby shows humans how to grow wise also.