The reign of Pope Urban II (1088-1099) is often seen as a turning point in the period of medieval history known as the Gregorian Reform. This volume presents for the first time modern editions of, and commentary on, the decrees of Urban's first papal council (at Melfi in 1089), and the excerpts of his acts found in the enigmatic canon-law book labelled the Collectio Britannica. Both editions are accompanied by English translations of the Latin texts...