A shattering chronicle of the life and death of the Cathar movement -- one of Western civilization's great tragedies.

At the beginning of the 13th century, the Cathars, a group of heretical Christians, thrived across what is now southern France, but was then a patchwork of city states and principalities beholden to neither king nor bishop. The Cathars held revolutionary beliefs that threatened the authority of the Catholic Church as well as the legitimacy of feudal law: they thought the idea of Hell, indeed the entire metaphysic constructed by the Church, to be a sham; they rejected all sacraments, including marriage; they thought private property an absurd notion and that all things worldly were corrupt; they gave women religious status equal to men.

Though they lived peacefully, the Cathars growing influence enraged a Catholic Church that was flexing its muscle after decades of weakness, and its powerful Pope, Innocent III. The Church recruited the forces of France, eager to expand her territory to the south, and systematically attacked the Cathars in crusades between 1209 and 1229. By the time the wars were over, the map of Europe had been rearranged, and the Inquisition -- unleashed.

Full of colourful and passionate personalities, The Perfect Heresy sheds new light on the 13th century and on the timelessness of religious intolerance.

Stephen O'Shea is an historian and the acclaimed author of Sea of Faith: Islam and Christianity in the Medieval Mediterranean World, The Perfect Heresy: The Revolutionary Life and Death of the Medieval Cathars, and Back to the Front: An Accidental Historian Walks the Trenches of World War I. Born in Toronto, he now lives in Providence, Rhode Island, and France.

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"Investing his story with the pace and excitement of a novel, O'Shea skillfully brings to life the tale of the medieval Cathars. Cogently, provocatively, and precisely argued."

Publishers Weekly

"An accessible, readable history with lessons that were not learned by broad humanity until it saw 20th century tyrants applying the goals and methods of the Inquisition on a universal scale."

The New York Times

"The best and most instructive story of the Cathars is the one that actually happened. O'Shea tells it well."

Globe & Mail

"The simple, unadorned narrative is gripping and makes its point all the more forcefully because of its lack of pretension."

Karen Armstrong, author of "The Bible" and "The Battle for God"