Anabasis is the most famous work of the Ancient Greek professional soldier and writer Xenophon. It narrates the expedition of a large army of Greek mercenaries hired by Cyrus the Younger to help him seize the throne of Persia from his brother, Artaxerxes II, in 401 BC. It is likely that the Anabasis, which was initially published under the pseudonym Themistogenes of Syracuse, was composed some 20 years after the events it describes. Textual evidence suggests that it was subsequently revised. Xenophon's Anabasis is a true story of remarkable adventures. Volume IV of the Loeb Xenophon edition collects four works on Socrates. In Memorabilia Xenophon adds to Plato's picture of Socrates from a different viewpoint.