•
Gerald of Wales, 1146-1223, (Oxford, 1982) •
Trial by fire and water : the medieval judicial ordeal (Oxford, 1986) • (ed. with Angus MacKay)
Medieval frontier societies •
The Making of Europe: Conquest, Colonization and Cultural Change, 950-1350 (London, 1993) •
England Under the Norman and Angevin Kings, (Oxford, 2000) •
Medieval and Modern Concepts of Race and Ethnicity (Scotland 2001) Published in
Journal of Medieval and Early Modern Studies 31:1, Winter 2001 • (ed.& tr.)
Life and miracles of St Modwenna, (Oxford, 2002, ) • (ed.& tr.)
The miracles of Saint Æbbe of Coldingham and Saint Margaret of Scotland, (Oxford, 2003, ) •
The Hanged Man: A Story of Miracle, Memory and Colonialism in the Middle Ages, (Princeton, 2005, ) •
Gerald of Wales: A Voice of the Middle Ages, (Tempus, 2006, ) [revised edition of
Gerald of Wales, 1146-1223] •
The Natural and the Supernatural in the Middle Ages (The Wiles Lectures), (Cambridge University Press, 2008, ) •
Why Can the Dead Do Such Great Things?: Saints and Worshippers from the Martyrs to the Reformation, (Princeton University Press, 2013, ) • (ed.& tr.)
Gerald of Wales: De Principis Instructione, (Oxford University Press, 2018, ) •
Blood Royal: Dynastic Politics in Medieval Europe, (Cambridge University Press, 2020, ) •
The Middle Ages and the Movies: Eight Key Films, (Reaktion Books, 2022, ) • (ed.& tr.)
The History of Llanthony Priory (Oxford University Press, 2022, ) •
History in Flames: The Destruction and Survival of Medieval Manuscripts, (Cambridge University Press, 2024, ) ==References==