"A prolonged labor of love [and] a model of a kind of penetrating adoration."--Richard Bernstein, New York Times

In this new edition of a classic work, the great Catholic apologist and historian Hilaire Belloc examines the five most destructive heretical movements in Christianity: Arianism, Mohammedanism (Islam), Albigensianism, Protestantism, and Modernism. Belloc describes how these movements began, how they spread, and how they have continued to influence the world. He accurately predicts the re-emergence of militant Islam and its violent aggression against Western civilization. When we hear the word "heresies", we tend to think of distant centuries filled with religious quarrels that seemed important at the time but are no longer relevant. Belloc shows that the heresies of olden times are still with us, sometimes under different names and guises, and that they still shape our world.

In The Great Heresies, Hilaire Belloc takes the reader on a fast and furious tour of European history seen through the lens of its chief religious conflicts - Arianism, 'Mohammedanism' (Islam), Albigensianism, the Reformation, and what he terms 'The Modern Phase.'

A study of the history and beliefs of Catharism.

Some of the most portentous events in medieval history—the Cathar crusade, the persecution and mass burnings of heretics, the papal inquisition—fall between 1000 and 1250, when the Catholic Church confronted the threat of heresy with force. Moore’s narrative focuses on the motives and anxieties of elites who waged war on heresy for political gain.

A fresh examination of the Cathar heresy, using the records of inquisitorial tribunals to bring out new details of life at the time.

The struggle over fundamental issues erupted with great fury in the eleventh and twelfth centuries. In this book preeminent medievalist Heinrich Fichtenau turns his attention to a new attitude that emerged in Western Europe around the year 1000. This new attitude was exhibited both in the rise of heresy in the general population and in the self-confident rationality of the nascent schools. With his characteristic learning and insight, Fichtenau shows how these two separate intellectual phenomena contributed to a medieval world that was never quite as uniform as might appear from our modern perspective.