In Greek mythology, Orestes or Orestis was the son of Clytemnestra and Agamemnon, and the brother of Electra. He is the subject of several Ancient Greek plays and of various myths connected with his madness and purification, which retain obscure threads of much older ones.
Orestes at Delphi flanked by Athena and Pylades among the Erinyes and priestesses of the oracle, perhaps including Pythia behind the tripod – Paestan red-figured bell-krater, c. 330 BC
Orestes and Iphigeneia on an antique mosaic, Musei Capitolini
Orestes, Elektra, and Pylades at the tomb of Agamemnon - Campanian red-figure hydria, c. 330 BC
Orestes Pursued by the Furies by William-Adolphe Bouguereau
Aegisthus was a figure in Greek mythology. Aegisthus is known from two primary sources: the first is Homer's Odyssey, believed to have been first written down by Homer at the end of the 8th century BC, and the second from Aeschylus's Oresteia, written in the 5th century BC. Aegisthus also features heavily in the action of Euripides's Electra, although his character remains offstage.
Pierre-Narcisse Guérin's Clytemnestra and Agamemnon, in which Aegisthus appears as a shadowy figure pushing Clytemnestra forward