This is the most comprehensive history of the great heretical movements of the Middle Ages since H. C. Lea's pioneering work of 1888. Malcolm Lambert provides a vivid account of the dark, often secret, world of dissent and protest against the medieval churches of Rome and Byzantium.
Malcolm Lambert was Reader in Medieval History at the University of Bristol until 1991 when he retired to devote himself to writing and research. His previous books are Franciscan Poverty (1961, reissued 1998) and The Cathars (paperback edition, 1998). He is now working on a history of the Conversion of Britain.