A hero, son of Thyestes. At Argos he seduces Agamemnon's wife, Klytaimnestra, and together they murder him on his return from Troy. Aigisthos is in turn killed by Agamemnon's son Orestes.
Above: The murder of Aigisthos by Orestes. Detail from Athenian red-figure clay vase, late archaic period. Vienna, Kunsthistorisches Museum © Kunsthistorisches Museum