The medieval Latin Christian narratives of the crusades are replete with references to miracles, visions and signs; but these references have never been studied together before. This is the first far-reaching examination of the miraculous in crusade narrative, offering an analysis of the role of miracles, marvels, visions, dreams, signs and augury in narratives of the crusades of 1096 to1204 and produced between c.1099 and c.1250. It argues that the miraculous and its related themes represented a powerful tool for the authors of crusade narrative because of its ability to convey divine agency and will, ideas which were central to the belief held among Latin Christian contemporaries that the crusade was divinely inspired and spiritually salvific.