There once came a day when Agamemnon's father, King Atreus, got dethroned and murdered by his brother, Aegisthus. Therefore, Agamemnon and his brother Menelaus had to take refuge with Tyndareus, the king of Sparta. AWhile in his palace, Agamemnon fell in love with wanted Clytemnestra, the daughter of Tyndareus and, in order to take her for his wife he killed her first husband and her child. He then married Clytemnestra and Menelaus married Clytemnestra’s half sister, Helen.
Agamemnon and Clytemnestra had four children: Iphigenia, Electra, Chrysothemis and Orestes.
The Sacrifice of Iphigenia
Before setting off to Troy, Agamemnon tried to appease goddess Artemis to calm the wings of the Greek sails and make them arrive safely in Troy. For this reason, Agamemnon was told by the prophet Calchas to sacrifice his eldest daughter Iphigenia to Artemis. Agamemnon finally consented and Iphigenia was brought to Aulis, an ancient Greek town in Boeotia, in order to be sacrificed. In the end, however, Artemis decided to rescue Iphigenia and carried her away, placing a deer in her place.
The Revenge of Clytemnestra
Clytemnestra never forgave Agamemnon for sacrificing their daughter and, by the time Agamemnon was fighting in the Trojan War, she cheated on her husband with Agamemnon’s cousin, Aegisthus. And when Agamemnon returned from Troy, bringing his mistress Cassandra with him, Clytemnestra became even more angry and she slay both Agamemnon and Cassandra with an axe. Aegisthus was Clytemnestra‘s accomplice, but got later on killed in revenge by Clytemnestra's son, Orestes.