Ivo of Chartres was one of the most learned scholars of his time, a powerful bishop and a major figure in the so-called 'Investiture Contest'. Christof Rolker here offers a major new study of Ivo, his works and the role he played in the intellectual, religious and political culture of medieval Europe around 1100 AD. Comparing Ivo's extensive correspondence to the contemporary canon law collections attributed to him, Dr Rolker provides a new interpretation of their authorship. Contrary to current assumptions, he reveals that Ivo did not compile the Panormia, showing that its compiler worked in a distinctly different mental framework from Ivo. These findings call for a reassessment of the relationship between Church reform and scholasticism and shed new light on Ivo as both a scholar and bishop.