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 as source 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, the Christian topography of the Levant, and the history of the anti-Chalcedonian movement in Palestine.