On the subject of leadership, the Athenian soldier, historian, biographer and essayist Xenophon (c. 430-354 BC) had much to say, having led the retreat of 10,000 Greek soldiers from Cunaxa (Iraq) through hostile territory back to Greece. Had Dominic Cummings paid more attention to him when he studied ancient and modern history at Oxford, his time in government might have been more successful.