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Which Persian prince did Xenophon join on a military expedition?

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Xenophon joined the military expedition of the Persian prince Cyrus the Younger.12

Cyrus, a son of the Achaemenian king Darius II, sought to seize the Persian throne from his brother, Artaxerxes II. Xenophon accompanied the force of Greek mercenaries in a private capacity during this campaign, which culminated in the Battle of Cunaxa in 401 BCE. Following the death of Cyrus at the battle, Xenophon played a pivotal role in leading the surviving Greek soldiers—known as the "Ten Thousand"—on their successful retreat to the Black Sea, an experience he later chronicled in his work, the Anabasis.1324