Christianity
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- The Gospel of the Holy Twelve
- This text is claimed by Rev. G. J. Ouseley to be the original gospel from which the present Four Gospels were derived.
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- Chalcedon, Council of
- The Fourth Ecumenical Council, held in 451, from 8 October until 1 November inclusive, at Chalcedon, a city of Bithynia in Asia Minor.
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- Constantinople, First Ecumenical Council of
- Called in May, 381, by Emperor Theodosius, to provide for a Catholic succession in the patriarchal See of Constantinople, to confirm the Nicene Faith, to reconcile the semi-Arians with the Church, and to put an end to the Macedonian heresy.
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- Ecumenical Councils
- Summary article on the first 7 councils jointly held by the Roman Catholic and Eastern Orthodox churches.
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- Nicaea, First Council of
- First Ecumenical Council of the Catholic Church, held in 325 on the occasion of the heresy of Arius. It defined the Nicene Creed.