AGAMEMNON, _son of Atreus and King of Argos and Mycenae;
Commander-in-Chief of the Greek armies in the War against Troy._
CLYTEMNESTRA, _daughter of Tyndareus, sister of Helen; wife to
Agamemnon._
AIGISTHOS, _son of Thyestes, cousin and blood-enemy to Agamemnon, lover
to Clytemnestra._
CASSANDRA, _daughter of Priam, King of Troy, a prophetess; now slave to
Agamemnon._
A WATCHMAN.
A HERALD.
CHORUS of Argive Elders, faithful to AGAMEMNON.