Xenophon – wrote possibly the first ever book on economics. He was an Athenian soldier, historian, and student of Socrates whose writings preserve important accounts of Greek history, military campaigns, and Socratic philosophy. His major works, including Anabasis, Hellenica, and Memorabilia, combine first-hand experience with practical reflections on leadership, ethics, and government. In Oikonomia, he argues that true wealth depends not on possessions themselves but on the knowledge and discipline required to manage them well.