Agamemnon in Wikipedia

In Greek mythology, Agamemnon (Ancient Greek: Ἀγαμέμνων; modern Greek: Αγαμέμνονας, "leader of the assembly") is the son of King Atreus of Mycenae and Queen Aerope; the brother of Menelaus and the husband of Clytemnestra; different mythological versions make him the king either of Mycenae or of Argos. When Helen, the wife of Menelaus, was abducted by Paris of Troy, Agamemnon was the commander of the Achaeans in the ensuing Trojan War. Upon his return from Troy he was murdered (according to the fullest version of the oldest surviving account, Odyssey Book 11, l.409f.) by Aegisthus, the lover of his wife Clytemnestra, who herself slew Cassandra, Agamemnon's unfortunate concubine, as she clung to him. In old versions of the story: "The scene of the murder, when it is specified, is usually the house of Aegisthus, who has not taken up residence in Agamemnon's palace, and it involves an ambush and the deaths of Agamemnon's followers too".[1] In some later versions Clytemnestra herself does the killing, or they do it together, in his own home...

Link: https://en.wikipedia.org/wiki/Agamemnon