A comparative history of heresy in Latin and Greek Christianity, Judaism, and Islam, spanning the fourth to the sixteenth century.

More than seventy documents, ranging in date from the early eleventh century to the early fourteenth century and representing both orthodox and heretical viewpo

Some of the most portentous events in medieval history—the Cathar crusade, the persecution and mass burnings of heretics, the papal inquisition—fall between

For the third edition, this comprehensive history of the great heretical movements of the Middle Ages has been updated to take account of recent research in the

Jews, Christians, and Muslims in the Middle Ages were divided in many ways. But one thing they shared in common was the fear that God was offended by wrong beli