Who was Xenophon?
(a later portrait, now in the Prado museum in Madrid)
Xenophon, like Thucydides, was an Athenian from a rich family who lived during the Peloponnesian War, in the 400s BC. Xenophon (ZEN-oh-fahn) also had a lot of family connections to people from Sparta, and he thought the Spartans were doing a lot of things right. When Xenophon was young, he studied with Socrates, like Alcibiades and Plato and other young Athenian men of that time. Xenophon's description of Socrates is the most detailed one we have after the one by Plato.
After the Athenians lost the Peloponnesian War in 404 BC, Xenophon (who had become a general) found himself leading a group of mercenary soldiers, who would fight for whoever would pay them. They found work fighting for Cyrus, the brother of the Persian king. Cyrus wanted to be king himself, and he hired all these Greek mercenaries to fight the Persian army so he could become king.
Xenophon and his soldiers did fight this battle, and they won. But Cyrus was killed in the battle, and so they found themselves deep in the Persian Empire, with nobody to make king. They had many dangerous adventures before they were able to fight their way back out of Persia to Greece.
After he got home to Athens, Xenophon wrote down the story of these adventures, which is called the Anabasis (ah-NAH-bah-siss). That's Greek for "going up there" - that is, going up to Persia.
Learn by doing: compare the relationship of Greece and Persia with the relationship of Mexico and the United States
More about Hellenistic Greece
Ancient Greeks: Creating the Classical Tradition (Oxford Profiles) by Rosalie F. Baker and Charles F. Baker (reprinted 1997). Short biographies of many famous Greeks including Xenophon.
The Persian Expedition (Penguin Classics) by Xenophon. Translated by Rex Warner.
Xenophon's March: Into the Lair of the Persian Lion, by John Prevas (2002). A popularized retelling of Xenophon's story.