Atreus was murdered by Aegisthus, who took possession of the throne of Mycenae and ruled jointly with his father Thyestes.
His kinsman, Aegisthus, who in the interval had seduced his wife Clytaemnestra, invited him to a banquet at.
Among the titles of his tragedies are Aegisthus, Lycurgus, Andromache or Hector Proficiscens, Equus Trojanus, the last named being performed at the opening of Pompey's theatre (55).
He reached Sparta on the day on which Orestes was holding the funeral feast over Aegisthus and Clytaemnestra.
AEGISTHUS, in Greek legend, was the son of Thyestes by his own daughter Pelopia.
When he grew up Aegisthus slew Atreus, and ruled jointly with his father over Mycenae, until they were deposed by Agamemnon on his return from exile.
After the departure of Agamemnon to the Trojan war, Aegisthus seduced his wife Clytaemnestra (more correctly Clytaemestra) and with her assistance slew him on his return.
After the murder of her father on his return from Troy by her mother and Aegisthus, she saved the life of her brother Orestes by sending him out of the country to Strophius, king of Phanote in Phocis, who had him brought up with his own son Pylades.
Being admitted to the palace, he slays both Aegisthus and Clytaemnestra.
In the meantime Aletes, the son of Aegisthus, seized the throne of Mycenae.
Subsequently Atreus married the daughter of Thyestes, Pelopia, who had by her own father a son, Aegisthus, who was adopted by Atreus.
Aegisthus being sent to murder Thyestes, mutual recognition took place, and Atreus was slain by the father and son, who seized the throne, and drove Agamemnon and Menelaus out of the country (Thucydides i.
Orestes, according to Zielinski, is the son of the sky-god Zeus-Agamemnon, who overcomes his wife the earth-goddess Gaia-Clytaemnestra; with the assistance of the dragon Aegisthus, she slays her husband, whose murder is in turn avenged by his son.