Philippe Forêt, Ph.D. (1992) in Geography, University of Chicago, is a Researcher at the Swiss Federal Institute of Technology of Zurich and an Associate Professor at the University of Nottingham. He is the author of Mapping Chengde (Honolulu, 2000) and La véritable histoire d’une montagne plus haute que l’Himalaya (Paris, 2004), and the coeditor of La Haute-Asie telle qu’ils l’ont vue (Geneva, 2003) and New Qing Imperial History (London, 2004).Andreas Kaplony, Dr. (1986) in History and Arabic studies and Habilitation (2001) in Islamic studies, both from the University of Zurich, is an Assistant Professor at the Oriental Institute, University of Zurich. He is the author of Konstantinopel und Damaskus: Gesandtschaften und Verträge zwischen Kaisern und Kalifen 639–750(Berlin, 1996) and The Ḥaram of Jerusalem 324–1099 (Freiburg i.Br., 2002), and the coeditor of the Arabic Papyrology Database (www.ori.uzh.ch/apd) (2006) and Documentary Letters from the Middle East: The Evidence in Greek, Coptic, South Arabian, Pehlevi, and Arabic (1st–15th c CE) (Berne, 2008).