Keywords: Persian Empire, 490 BC.png Version of File Persian Empire 490 BC gif altered to display better in Wikipedia articles converted to PNG format slightly cropped ; Persian Empire 490 BC showing route of Cyrus the Younger Xenophon and the 10 000 At the time of Xenophon The Persian Empire had already lost its foothold in European Thrace and many Greek cities on the coast of Asia Minor were independent of Persian rule ; Author/Source http //www dean usma edu/history/ The Department of History United States Military Academy ; Permission In the public domain as original works of the United States federal government and/or military http //www dean usma edu/history/web03/atlases/map 20home htm ; Other versions Italian version PD-USGov Military maps Maps of the United States Military Academy Maps showing 5th-century BCE history Maps of the Achaemenid Empire Ten Thousand campaign |