With him, he brings Cassandra, who foresees his murder as well as her own.  
It opens with a solitary watchman who notices a light, signaling the title character's approach.  The title character returns to Argos after the fall of Troy, describing how his galley was the only one to make it out of a squall.  With him, he brings Cassandra, who foresees his murder as well as her own.  Unbeknownst to him, his wife has taken his cousin Aegisthus as her paramour.  She proceeds to murder him in his bath, turn on Cassandra, and have Aegisthus use his bodyguards to exact control over Argos.  FTP, name this Aeschylus play, the first component of the Oresteia trilogy, which details the murder of Orestes's father by his mother Clytemnestra.
It opens with a solitary watchman who notices a light, signaling the title character's approach.  
Agamemnon