 Frank Sinatra (qv) refers to Orestes and Clytemnestra when he is  talking to Laurence Harvey (I) (qv). Clytemnestra was the wife of  Agamemnon (King of the Ancient Greek kingdom of Mycenae) who, with  her lover Aegisthus, murdered him and took over the throne. Orestes,  the son of Clytemnestra, later killed them both.