Aegisthus, i, m.
, = Αἴγισθος, 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.