This collection presents - through the medium of translated sources - a comprehensive guide to the developments of hagiography and the cult of saints in Western Christendom during the Middle Ages. It provides an unparalleled resource for the study of the ideals of sanctity and the practice of religion in the Medieval West. The great majority of the texts have never previously appeared in English translation. Those which have been translated and published previously are presented here in new versions, based on significant new textual and historical scholarship.