Rosamond McKitterick is Professor Emerita of Medieval History, University of Cambridge. Her most recent book is Rome and the Invention of the Papacy: The Liber Pontificalis (Cambridge 2020). Dorine van Espelo is Policy Advisor, Province of Gelderland, The Netherlands. She is co-editor of Religious Franks. Religion and Power in the Frankish Kingdoms: Studies in Honour of Mayke de Jong (Manchester 2016). Richard Pollard is Professor in the Department of History, Université du Québec à Montréal. He is the editor of Imagining the Medieval Afterlife (Cambridge 2020). Richard Price is Professor Emeritus of the History of Christianity, Heythrop College and Honorary Research Fellow, Royal Holloway, University of London. His many previous publications include The Acts of the Lateran Synod of 649 (with P. Booth & C. Cubitt, Liverpool 2014), The Acts of the Second Council of Nicaea (Liverpool 2018), The Council of Ephesus of 431 (with T. Graumann, Liverpool 2020), Canons of the Quinisext Council (691/2) (Liverpool 2020) and The Acts of the Council of Constantinople of 869-70 (with Federico Montinaro, Liverpool 2022).