Jelle Bruning is a University Lecturer in Middle Eastern Studies at Leiden University. He is the author of The Rise of a Capital: Al-Fusṭāṭ and Its Hinterland, 18/639-132/750 (2018). Janneke H. M. de Jong is a classicist and ancient historian with as expertise Greek papyrology. Her current research includes the social organization of the tax system of Aphrodito in the early Islamic period, and the preparation of editions of Greek papyri from late Byzantine and early Islamic Egypt. Petra M. Sijpesteijn is Professor of Arabic at Leiden University. She has published various academic and popular books and articles on the daily life experience of Muslims and non-Muslims in the caliphate.