Emilie Savage-Smith, FBA, was Professor of the History of Islamic Science, University of Oxford. Publications include A New Catalogue of Arabic Manuscripts in the Bodleian Library, I: Medicine (2012) and, with Y. Rapoport, Lost Maps of the Caliphs (2019)Simon Swain, FBA, is Professor of Classics, University of Warwick. Publications include Hellenism & Empire (1996), Seeing the Face, Seeing the Soul: Polemon’s Physigonomy from Classical Antiquity to Medieval Islam (2007), Economy, Family and Society from Rome to Islam (2013).Geert Jan van Gelder, PhD Leiden 1982; Lecturer in Arabic, University of Groningen, 1975–1998; Laudian Professor of Arabic, University of Oxford, 1998–2012. Fellow of the KNAW and the British Academy; author of many publications on Classical Arabic literature.Contributors: Ignacio Sánchez, N. Peter Joosse, Alasdair Watson, Bruce Inksetter, Franak Hilloowala.