Sensible, self-controlled, vigilant, frugal, enduring, understanding, and free from greed: What makes a successful leader? Almost 2000 years ago, Onasandros wrote the classic book on good leadership. It is dedicated to a political, military, and administrative expert of the Roman Empire and illustrates the qualities and behaviors expected from a leader. Intensively studied in modern times, the work later fell into obscurity and is now being presented in a bilingual format for the first time. Those who want to know what constitutes good leadership can learn a great deal from Onasandros today.