Uruk King List: historiographical document from ancient Babylonia, mentioning the length of the reigns of several kings from Kandalanu (r.647-627) to the Seleucid king Seleucus II Callinicus (r.246-226/225).
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Xenophon (c.430-c.354): Athenian soldier and historian, author of the Anabasis and Hellenica. He is one of the best-known and most widely read of all Greek authors.
There is more about him here.