The essays in this book give a comprehensive picture of the medieval development of philosophical theories concerning the nature of emotions and the influence they have on human choice. The historical span reaches from the late ancient to the early modern philosophy, showing in detail how old and new ideas were bred and brought into the Middle Ages, and how they resulted in a genuinely modern perspective in the thought of Descartes. The essays are original contributions by a mixture of senior scholars and young researchers writing on their own specialties.