Prognostication in the medieval world. A handbook. 2 vols. Edited by Matthias Heiduk, Klaus Herbers and Hans-Christian Lehner. Pp. xiv + 710, xii + 711–1027 incl. 57 colour and black-and-white ills. Berlin–Boston: Walter de Gruyter, 2021. £253.50. 978 3 11 050120 9 - Kaup, Matthias (The journal of ecclesiastical history, 2022)