The saga of the House of Atreus is one of the most blood-stained chronicles in the entirety of Greek myth, a cycle of violence that spanned generations. At the heart of this tragedy lies the story of Orestes, the son of King Agamemnon and Queen Clytemnestra. The conflict began in earnest when Agamemnon returned home to Mycenae after the ten-year siege of Troy. He arrived in a chariot, victorious and laden with spoils, including the Trojan prophetess Cassandra. However, his homecoming was not the joyous occasion he anticipated. During his absence, his wife Clytemnestra had taken a lover, Aegisthus—the son of Thyestes and a man with his own ancient grudge against Agamemnon’s lineage. Together, the conspirators murdered Agamemnon in his bath, a betrayal that left the throne in the hands of usurpers and the rightful heir, Orestes, in mortal peril.
Fearing for her brother's life, the young princess Electra managed to spirit Orestes away from the palace. He was sent to the court of King Strophius of Phocis, who lived near the slopes of Mount Parnassus. It was there that Orestes grew to manhood, shielded from the treacherous politics of Mycenae but never allowed to forget his heritage. He formed an unbreakable bond with Strophius's son, Pylades, a friendship that would become legendary for its loyalty and shared purpose. Despite the comforts of Phocis, the ghost of his murdered father and the pleas of his sister Electra, who remained in Mycenae living almost as a slave to her mother and Aegisthus, haunted Orestes’ dreams. The weight of his duty grew heavier with every passing year until it became unbearable.
Seeking guidance on how to proceed, Orestes traveled to the Oracle of Delphi. In the hallowed, smoke-filled chambers of the temple, the Pythia delivered a divine command from Apollo himself: Orestes must return to Mycenae and avenge his father’s death. The god was explicit—the blood of the murderers must be shed by the hand of the son. However, this command carried a terrifying moral weight. To kill Aegisthus was justice, but to kill Clytemnestra was matricide, one of the most heinous crimes a mortal could commit in the eyes of the ancient laws. Apollo promised Orestes protection and purification, but the young prince knew that by obeying the god, he would invite the wrath of the Erinyes, the Furies who relentlessly hounded those who spilled kindred blood.
Orestes and Pylades arrived at the gates of Mycenae in secret, disguised as humble travelers. They first made their way to the tomb of Agamemnon, which lay outside the city walls, neglected and overgrown. There, Orestes laid a lock of his hair upon the cold stone as an offering. It was at this moment that Electra appeared, sent by a fearful Clytemnestra to offer libations to the dead king after a night of terrifying omens. The siblings’ reunion was a convergence of shared grief and cold, calculated fury. Electra, withered by years of resentment, urged her brother to act swiftly. Together, they prayed to the spirit of their father and the gods of the underworld, asking for the strength to execute their grim task. Pylades remained at Orestes' side, a silent but steadfast reminder of the divine mandate they carried.
To gain entry to the palace, Orestes and Pylades employed a clever ruse. They presented themselves to the queen as messengers from Phocis, bearing the 'grim news' that Orestes had died in a chariot race. Clytemnestra’s reaction was a complex mixture of relief and maternal sorrow; with Orestes dead, the primary threat to her reign was gone. Aegisthus, too, was summoned to hear the news. The usurper king arrived at the palace without his usual bodyguard, emboldened by the belief that his rival was no longer a threat. This was the opening Orestes needed. As Aegisthus entered the chamber to question the messengers, Orestes drew his sword and struck him down. The man who had helped steal a kingdom and a life died on the very floor where Agamemnon had fallen years prior.
The death of Aegisthus sent a shockwave through the palace, and Clytemnestra soon realized the truth. She confronted the young man, recognizing him as her son. In a desperate attempt to save herself, she bared her breast to him, reminding him of the mother who had nursed him and the life she had given him. Orestes faltered. The sword in his hand trembled as the enormity of the act—killing his own mother—loomed before him. He turned to Pylades and asked if he should show mercy. Pylades, speaking for the only time in many versions of the play, reminded him of the Oracle's decree: 'What then becomes of the oracles of Apollo? What of your sworn oaths? Count all men your enemies, rather than the gods.' Reinvigorated by the reminder of his divine duty, Orestes steeled his heart and led Clytemnestra into the palace, where he carried out the execution.
The immediate aftermath of the double killing was not the peace Orestes had hoped for. As he stood over the bodies of the usurpers, he began to see things that no one else could. Figures with snakes for hair and eyes weeping blood emerged from the shadows—the Erinyes. They were the personification of his mother's curse, and they began to swarm around him, their shrieks audible only to his ears. Despite his justification and the support of Electra, Orestes was driven into a state of temporary madness by the spectral hags. He fled the palace, leaving the city of Mycenae behind, beginning a long and agonizing pilgrimage to seek formal trial and purification in Athens, eventually leading to the establishment of the Areopagus court.