(Θυέστης), a son of Pelops and Hippodameia, was the brother of Atreus and the father of Aegisthus. (Horn. Il. 2.107; Aeschyl. Agam. 1242 ; Eurip. Or. 1008 ; comp. ATREUS ; PELOPS; AGAMEMNON.)
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890