Conrad Leyser examines the formation of the Christian ascetic tradition in the western Roman Empire during the period of the barbarian invasions, c.400-600. In an aggressively competitive political context, one of the most articulate claims to power was made, paradoxically, by men who hadrenounced 'the world', committing themselves to a life of spiritual discipline in the hope of gaining entry to an otherworldly kingdom. Often dismissed as mere fanaticism or open hypocrisy, the language of ascetic authority, Conrad Leyser shows, was both carefully honed and well understood in thelate Roman and early medieval Mediterranean. Dr Leyser charts the development of this new moral rhetoric by abbots, teachers, and bishops from the time of Augustine of Hippo to that of St Benedict and Gregory the Great.

Conrad Leyser examines the formation of the Christian ascetic tradition in the western Roman Empire during the period of the barbarian invasions, c.400-600. In an aggressively competitive political context, one of the most articulate claims to power was made, paradoxically, by men who had renounced 'the world', committing themselves to a life of spiritual discipline in the hope of gaining entry to an otherworldly kingdom. Often dismissed as mere fanaticism or open hypocrisy, the language of ascetic authority, Conrad Leyser shows, was both carefully honed and well understood in the late Roman and early medieval Mediterranean. Dr Leyser charts the development of this new moral rhetoric by abbots, teachers, and bishops from the time of Augustine of Hippo to that of St Benedict and Gregory the Great.

Gregory the Great (bishop of Rome from 590 to 604) is one of the most significant figures in the history of Christianity. His theological works framed medieval Christian attitudes toward mysticism, exegesis, and the role of the saints in the life of the church. The scale of Gregory's administrative activity in both the ecclesial and civic affairs of Rome also helped to make possible the formation of the medieval papacy. Gregory disciplined malcontent clerics, negotiated with barbarian rulers, and oversaw the administration of massive estates that employed thousands of workers. Scholars have often been perplexed by the two sides of Gregory—the monkish theologian and the calculating administrator. George E. Demacopoulos's study is the first to advance the argument that there is a clear connection between the pontiff's thought and his actions. By exploring unique aspects of Gregory's ascetic theology, wherein the summit of Christian perfection is viewed in terms of service to others, Demacopoulos argues that the very aspects of Gregory's theology that made him distinctive were precisely the factors that structured his responses to the practical crises of his day. With a comprehensive understanding of Christian history that resists the customary bifurcation between Christian East and Christian West, Demacopoulos situates Gregory within the broader movements of Christianity and the Roman world that characterize the shift from late antiquity to the early Middle Ages. This fresh reading of Gregory's extensive theological and practical works underscores the novelty and nuance of Gregory as thinker and bishop.

Ascetic Pneumatology from John Cassian to Gregory the Great presents three interconnected arguments. The first argument concerns scholarly readings of antiquity: there are developments in 5th and 6th century Latin pneumatology which we have overlooked. Theologians like John Cassian and Gregory the Great were engaged in a significant discussion of how the Holy Spirit works within Christian ascetics to reform their inner lives. Other theologians, like Leo the Great, participate to a lesser extent in a similar project. They applied pneumatology to theological anthropology. Thomas L. Humphries, Jr. labels that development "ascetic pneumatology," and beings to track some of the late antique schools of thought about the Holy Spirit. The second argument concerns the reception of Augustine in the two centuries immediately after his death: different people read Augustine differently. Augustine's theology was known and understood to varying degrees in various regions. Humphries demonstrates significant engagements with Augustine's theology as it was relevant to Pelagianism (evidenced in Prosper of Aquitaine), as it was relevant to Gallic Arians (evidenced with the Lérinian theologians), and as it was relevant to African Arians and certain questions posed of Nestorianism (evidenced with Fulgentius of Ruspe). Instead of attempting to rank various theologians as better and worse "Augustinians," Humphries argues that there were different kinds of "Augustinianisms" even in the years immediately after Augustine. The third argument concerns Gregory the Great and his sources. Once we see that ascetic pneumatology was a strain of thought in this era and see that there are different kinds of Augustinianisms, we can see that Gregory depends on both Augustine and Cassian. In the closing chapters, Humphries argues that Gregory uses Cassian's ascetic pneumatology, and this allows Gregory's synthesis of Cassian and Augustine to stand in greater relief than it has before. The study begins with Cassian, ends with Gregory, and is attentive to Augustine throughout.

A study of how Christians understood the Holy Spirit in the 5th and 6th centuries. Humphries argues that we can see various schools of thought within Christianity in this period, but that many of them are occupied with similar questions about how to understand human life and how to understand divine life.

The Life of Peter the Iberian by John Rufus records the ascetic struggle of a fifth-century anti-Chalcedonian bishop of Mayyuma, Palestine. Cornelia Horn presents a historical-critical study of the only substantial anti-Chalcedonian witness to the history of the conflict in Palestine and analyses the formative period of fifth-century anti-Chalcedonian hierarchy, theology, and its ascetic expression. Important themes are pilgrimage as an ascetic ideal and asceticism assource of theological authority. Archaeological data on many places in the Levant and textual sources in Syriac, Coptic, Greek, Armenian, and Georgian are examined. This book contributes to our understanding of the origins of anti-Chalcedonian theology and the influence of asceticism on its development, theChristian topography of the Levant, and the history of the anti-Chalcedonian movement in Palestine.

The book is an important contribution to the current debate about the usefulness of Egyptian hagiography as a historical source for late antique Egypt and to the study of the reception of the desert fathers in the medieval West.