This book presents a complete analysis of the First Crusade, including the latest research and a new introduction. In this classic work, Jonathan Riley-Smith considers the realities of the events surrounding the beginning of the crusading age. He discusses the launching of the First Crusade, Pope Urban's message, the practical experience of the crusaders and the interpretation of this experience by historians since. A brand new introduction places the work in the context of changing thought and research by medieval historians. This includes both advances made in the development of crusading theory and theology as well as the politics of the Middle Ages. This book represents the best scholarship available and will be of great value to all students of the period.