During late antiquity, an interesting doctrinal shift can be observed: Aristotelian logic and its Neoplatonic complements, in particular the teachings of Aristotle's Categories and Porphyry's Isagoge, were progressively accepted as a tool in Christian theology. This acceptance met drawbacks and was never unanimous. Among the authors who used concepts that originated in logic in order to support their theological thinking, we can mention, on very different accounts, Basil of Caesarea, Gregory of Nyssa, Cyril of Alexandria, John Philoponus, Leontius of Byzantium, Maximus the Confessor, Theodore of Raithu, and John of Damascus, the author of an important Dialectica. In the Byzantine context, handbooks of logic were written specifically for Christian theologians, showing that logic was perceived to be an important tool for theological thinking.