interrelationship of its members. This book is an account of those canonistic theories of Church government which contributed to the growth of the conciliar theory, and which were formulated between Gratian's Decretum (c. 1140) and the Great Schism (1378). It is concerned particularly with the juristic development of the fundamental conciliar doctrine, the assertion that the universal Church was superior to the Church of Rome, with a consequent denial of the Pope's supreme authority. Foundations of the Conciliar Theory is considered by many to be one of those rare books that significantly influenced twentieth century medieval studies. Now again available in a new enlarged edition, it will continue to be an indispensable work for all those interested in Church history and the Middle Ages.

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