All four were held in the capital of the former Byzantine Empire; all were Æcumenical. The principal acts of these Councils were disciplinary and dogmatic.
The First Council of Constantinople, 381, condemned Arianism, Macedonianism, and kindred heresies. It formally approved of the Nicene-Constantinopolitan Creed.
The Second Council of Constantinople, 553, anathematized the "Three Chapters," and issued dogmatic condemnations against Arius, Nestorius, and other heretics.
The Third Council of Constantinople, 618, defined the Church's doctrine on the two wills (human and Divine) in Christ, at the same time anathematizing the opposite (Monothelitic) heresy.
The Fourth Council of Constantinople, 869, condemned Photius and the acts of the false Photian councils
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