Cleitarchus or Clitarchus (Greek: Κλείταρχος), one of the historians of Alexander the Great, son of the historian Dinon of Colophon, was possibly a native of Egypt, or at least spent a considerable time at the court of Ptolemy Lagus. He was active in the mid to late 3rd century BCE.
Quintilian (Instit. x. I. 74) credits him with more ability than trustworthiness, and Cicero (Brutus, II) accuses him of giving a fictitious account of the death of Themistocles. But there is no doubt that his history was very popular, and much used by Diodorus Siculus, Quintus Curtius, Justin and Plutarch, and the authors of the Alexander romances. His unnatural and exaggerated style became proverbial.
A recent papyrological find from Oxyrhynchus (P.Oxy. LXXI 4808) records that he was a tutor (διδάσκαλος) of Ptolemy IV Philopator, r.221–205 BCE, and suggests that he wrote in the mid to late 3rd century, not, as was hitherto thought, in the late 4th. Luisa Prandi (2012) has recently restated the case for the 'high' dating.
- This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press.
- Luisa Prandi, Fortuna e realtà dell'opera di Clitarco (Stuttgart: Franz Steiner Verlag, 1996) (Historia. Einzelschriften, 104).
- Luisa Prandi, ′New Evidence for the Dating of Cleitarchus (POxy LXXI.4808)?′, Histos 6 (2012), 15-26, 
- Livius, Cleitarchus by Jona Lendering
- Histos, In Search of Cleitarchus by A.B. Bosworth
- Pothos.org, Dating Kleitarchos by Karl Soundy
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