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

Menelaus, brother to Agamemnon, husband of Helen, and King of Sparta

The two sons of Atreus are called the Atreidae

Helen, most beautiful of women; daughter of Tyndareus, wife to Menelaus; beloved and carried off by Paris

Paris, son of Priam, King of Troy, lover of Helen. Also called Alexander

Priam, the aged King of Troy

The Greeks are also referred to as Achaians, Argives, Danaans; Troy is also called Ilion