It is quite a hazardous undertaking to seek at the same time to take into account the most recently published research by historians on a particular question and also to present it in as simple and honest a manner as possible to an inquiring but generally non-specialist reader. The difficulty becomes even greater when the domain in question is so vast, chrono-logically and geographically speaking, and so varied and complex in theme that it would be rash indeed for anyone to claim to be an authority on the entire history of the Waldensians. Who could maintain that they had read and studied the entire corpus of available sources written in various languages and scattered throughout Europe?

It would be presumptuous indeed for me to claim that this work presents an overview just of my own research into such varied aspects of the Waldensians' history across the centuries. My aim, rather, has been to make accessible to the ‘enlightened amateur’ the results of the latest research on the question, both my own and that of other specialists in Waldensian history. I have purposely omitted those works which I consider unreliable. I believe I have mentioned all those which I deem important. All works and articles which provided me with information have been cited: the reader will find relevant publications and other sources listed at the end of each chapter.