This valuable volume of conference proceedings commemorates the ninth centenary of the foundation of the Parisian abbey of St Victor (traditionally dated to 1108). St Victor was one of the most creative and influential houses of regular canons in the Middle Ages. Particularly in the twelfth and thirteenth centuries, it was home to many prominent authors, composers and mystics, most notably Hugh (d. 1142), Adam (d. post 1146), Achard (d. 1171), Richard (d. 1173), Andrew (d. 1175) and Thomas Gallus (d. 1246). While not neglecting these authors themselves, the contributions collected here focus first and foremost on the influence which their writings and ideas exercised on later thinkers, doctrines and institutions. The essays, with the exception of welcoming material from local notables, can be divided into four groups. The opening articles summarise the conference's main aims and findings. Of greatest interest are the introduction by Dominique Poirel, which attempts to articulate the common conclusions reached by the conference participants, Patrice Sicard's reflections on the origins, nature and influence of the Victorine school, and Pascale Bourgain's article on Victorine literary style. A second group of articles explores the means by which the abbey exerted its intellectual and cultural influence. Julian Führer and Rolf Grosse examine St Victor's ecclesiastical and political relationships, while Cédric Giraud, Constant J. Mews and Jacques Verger investigate the abbey school and its relationship to other schools of thought and educational institutions. A third group of articles investigates St Victor's influence on the arts and sciences. Gilbert Dahan addresses biblical exegesis, Isabelle Guyot-Bachy historical writing, Danielle Jacquart mathematical and natural sciences, Mathieu Arnoux the influence of the Didascalicon, Antoine Guggenheim Hugh's influence on Thomas Aquinas (1225–74), Rainer Berndt Hugh's influence on the summa genre, Charles de Miramon Hugh's conception of spiritualia, Csaba Németh the reception of Pseudo-Dionysius, Thierry Lesieur Hugh's conception of reason and rationality, and Grover A. Zinn Hugh's conception of spiritual formation as found in the De institutione novitiorum, while Margot Fassler, Jean-Baptiste Lebigue and Martina Schilling examine St Victor's impact on music, liturgy and architecture respectively. A fourth group of articles investigates the influence of the Victorines on later religious and intellectual milieux. Eduard Frunzeanu and Monique Paulmier-Foucart, Sylvain Piron, Christian Trottmann and Nikolaus Staubach examine the impact of the Victorines on the Dominicans, Franciscans, Carthusians and devotio moderna respectively, while Jean-Louis Quantin investigates the reception of Hugh and Richard of St Victor in early modern printings of their Opera omnia. The volume closes with a conclusion by Jacques Dalarun followed by supplementary material: the catalogue of the manuscript exhibition held at the Bibliothèque Mazarine in conjunction with the conference, complete with eight colour plates; and the text (in Latin but with French and English translations) of sequences composed by Adam of St Victor that were performed on 25 September 2008 at Notre-Dame in Paris by the Gregorian Ensemble of Our Lady of Notre-Dame under the direction of Sylvain Dieudonné. The back of the volume includes a CD-ROM with an audio recording of the concert.