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.