Pieter Sjoerd van Koningsveld, Ph.D. (1976), Leiden University, was until his retirement Professor of Islamic Studies at that university. He published widely on Al-Andalus and the history of Muslim minorities in Europe as well as on modern Islam. He passed away in 2021. His last monograph was entitled An Arabic Source of Ramon Martí. Al-Saif al-Murhaf fī al-Radd ʿalā al-Muṣḥaf (“The Whetted Sword in Refutation of the Koran”). Introductory Study with Text and Translation of its Surviving Fragments (Leiden: Aurora, 2018). Gerard Albert Wiegers, Ph.D. (1991), Leiden University, is Professor of History and Comparative Religious Studies at the University of Amsterdam. He has published widely on the history of Muslim-Jewish-Christian relations and Muslim minorities in Europe. His most recent publication (co-edited with Mercedes García-Arenal) is entitled The Iberian Qurʾan. From the Middle Ages to Modern Times (Berlin and Boston: De Gruyter, 2022).The two authors cooperated for many years in the study of the Arabic and Romance writings (often in Arabic script, Aljamiado) of the Muslim minorities in Medieval and Early Modern Christian Iberia. Their publications in this field have appeared in books and international peer-reviewed journals, such as, for example, their article ‘The Islamic Statute of the Mudejars in the Light of a New Source’ (Al-Qanṭara XVII, 1996).
