T. M. Charles-Edwards is Jesus Professor of Celtic at the University of Oxford, and a Fellow of Jesus College, Oxford. His most recent book, Early Christian Ireland, is published by Cambridge University Press. Morfydd E. Owen is an Honorary Departmental Fellow in the Department of Welsh at the University of Wales, Aberystwyth and has published on medieval Welsh medical texts, poetry and law. Paul Russell is Head of Classics at Radley College and a Visiting Lecturer in Celtic at the University of Oxford. He has published widely on Celtic philology and linguistics.