Contents -- List of Contributors -- List of Abbreviations -- Setting the Scene -- Demons and the Devil in Ancient and Medieval Christianity: Introduction, Summary, Reflection -- Monotheismus und Teufelsglaube: Entstehung und Psychologie des biblischen Satansmythos -- Stoics on Souls and Demons: Reconstructing Stoic Demonology -- The New Testament and its Reception in Early Christianity -- Demons and Exorcisms in the Gospel of Mark -- The Application of Magical Formulas of Invocation in Christian Contexts -- Exorcism: Tackling the Devil by Word of Mouth -- Ancient Christianity -- Justin Martyr and his Demon-ridden Universe -- Demons Without and Within: The Representation of Demons, the Saint, and the Soul in Early Christian Lives, Letters and Sayings -- Demons among the Messalians -- Medieval Christianity -- Denominations of the Devil and Demons in ihe Missale Gothicum -- Overshadowing or Foreshadowing Return: The Role of Demons in Eriugena's Periphyseon -- Horror vacui: Evil in the Incarnated World of the Bibles Moralisées -- Index locorum.