Katharina Greschat (PhD in Theology 1996, University of Münster) is Professor of Church History and the History of Christianity at Ruhr University Bochum. In the Winter Term 2025/26, she was a POLY Writing Fellow in the Writing Group "Embodying Christianities." During the group's meetings at Forschungskolleg Humanwissenschaften Bad Homburg in December 2025 and May 2026, she developed her contribution to the first volume of POLY's forthcoming three-volume book project, Doing Christianity: A Praxeological Guide to Polycentricity and Plurality of Premodern Christianities.