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As the central authority declined, people turned to discussing the nature of Christ, the relationship that existed between the Emperor and Pope, and also the many problems relating to the Trinity. One heresy succeeded another at an extraordinary pace and, although the Church called numerous ecumenical councils, the difficulties remained unsolved. Here were born the Monophysites, the Duophysites, the Nestorians, the Albigentsians, the iconoclasts and many other such heresies.