See [http://www.dailycatholic.org/history/councils.htm Major Councils of the Church (dailycatholic.org)]
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The Pope officially either directly presided over the [[Ecumenical council]]s of the Christian Church or he sent his personal representatives to act and speak in his name with his authority.
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See the following articles:
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The First Ecumenical Council: [[Council of Nicaea|First Council of Nicaea]] 325
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The Second Ecumenical Council: [[Constantinople I|First Council of Constantinople]] 381
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The Third Ecumenical Council: [[Council of Ephesus]] 431
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The Fourth Ecumenical Council: [[Council of Chalcedon]] 451
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The Fifth Ecumenical Council: [[Constantinople II|Second Council of Constantinople]] 553
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The Sixth Ecumenical Council: [[Constantinople III|Third Council of Constantimople]] 680-681
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The Seventh Ecumenical Council: [[Nicaea II|Second Council of Nicaea]] 787
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The Eighth Ecumenical Council: [[Constantinople IV|Fourth Council of Constantinople]] 869-870
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See also [http://www.dailycatholic.org/history/councils.htm Major Councils of the Church (dailycatholic.org)]