Mark Gregory Pegg

​Professor of History
PhD, Princeton University
BA, University of Sydney
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    • Washington University
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      St. Louis, MO 63130-4899
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    ​Professor Pegg's three books have focused on the Eurasion medieval world, the Albigensian crusade, and the Great Inquisition of 1245-1246. He teaches courses on the Middle Ages, medieval history, and Western civilization.


    Beatrice's Last Smile: A History of the Medieval World, 300-1500. (New York-Oxford: Oxford University Press, forthcoming). A comparative history of the medieval world across Eurasia.

    A Most Holy War: The Albigensian Crusade and the Battle for Christendom (New York: Oxford University Press, 2007; paperback 2009). (Polish translation from Rebis: Poznan, 2010).

    The Corruption of Angels: The Great Inquisition of 1245-1246 (Princeton: Princeton University Press, 2001; paperback, 2005).

    Selected Publications

    Peer-Reviewed Articles

    “The Paradigm of Catharism; or, the Historians’ Illusion,” in Cathars in Question, ed. Antonio Sennis (Woodbridge: Boydell and Brewer, 2016), pp. 21-52.

    “Innocent III, les Pestilentiels Provençaux et le paradigme épuisé du catharisme,” Cahiers de Fanjeaux:Innocent III et le Midi  50 (2015): 225-279.

    “A Cautionary Note,” in Center and Periphery: Studies on Power in the Medieval World Honor of William Chester Jordan, eds. Katherine Jansen, Guy Geltner, and Anne Lester (Brill: Leiden, 2013), pp. 249-262.

    “Albigenses in the Antipodes: An Australian and the Cathars,” Journal of Religious History, 35 (2011): 577-600.

    “Historians and Inquisitors: Testimonies from the Early Inquisitions into Heretical Depravity,” Primary Sources and the Study of Medieval History, ed. Joel Rosenthal (London: Routledge, 2012), pp. 98-113.

    “The Cathars and the Albigensian Crusade,” in The Byzantine and Crusader Mediterranean (6th-14th Centuries): Trade, Cultural Exchange, Warfare, and Archaeology: Festschrift for John Pryor, eds. Ruthy Gertwagen and Elizabeth Jeffreys (Aldershot: Ashgate, 2012), pp. 329-351.

    "Heresy, Good Men and Nomenclature," in Heresy and the Persecuting Society in the Middle Ages. Essays on the Work of R.I. Moore, ed. Michael Frassetto (Leiden: Brill, 2006), pp. 227-239.

    "'Catharism' and the Study of Medieval Heresy," New Medieval Literatures, 6 (2004): pp. 249-269.

    "Questions About Questions: Toulouse 609 and the Great Inquisition of 1245-1246," in Trials and Treatises: Texts on heresy and Inquisition, eds. Peter Biller and Caterina Bruschi (Woodbridge: Boydell and Brewer, 2003), pp. 111-125.

    "On the Cathars, the Albigensians and good men of Languedoc," Journal of Medieval History, 27, (2001): pp. 181-195

    "Le corps et l'autorite: la lepre de Baudouin IV," Annales ESC, 45 (1990): pp. 265-287.

    Work in Progress

    Holiness: A History: a study of holiness from the ancient to the early modern world.