Christians always admired and venerated martyrs who died for their faith, but for a long time thought that the bodies of martyrs should remain undisturbed in their graves. Initially, the Christian attitude toward the bones of the dead, whether a saint’s or not, was that of respectful distance. This book tells how, in the mid-fourth century, this attitude started to change, swiftly and dramatically. The first chapters show the rise of new beliefs. They study how, when, and why Christians began to believe in the power of relics, first, over demons, then over physical diseases and enemies; how they sought to reveal hidden knowledge at the tombs of saints and why they buried the dead close to them. An essential element of this new belief was a strong conviction that the power of relics was transferred in a physical way and so subsequent chapters study relics as material objects. The book seeks to show what the contact with relics looked like and how close it was. Did people touch, kiss, or look at the very bones, or just at reliquaries which contained them? When did the custom of dividing relics appear? Finally, the book deals with discussions and polemics concerning relics and tries to find out how strong was the opposition which this new phenomenon had to face, both within and outside Christianity on the way to relics becoming an essential element of medieval religiosity.