the son of Thyestes , who murdered Atreus and Agamemnon , with whose wife , Clytaemnestra , he lived in incest , and was finally slain by Orestes , Cic.N. D. 3, 38; Ov. R. Am. 161.— Hence, Pompey called Caesar Aegisthus, on account of his adulterous connection with Mucia, Suet.Caes. 50.