The First Ecumenical Council: [[Council of Nicaea|First Council of Nicaea]] 325
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The First Ecumenical Council: [[Council of Nicaea|First Council of Nicaea]] 325, called by the Roman Emperor [[Constantine]] the Great with Pope Saint Sylvester I sitting on the Throne of Peter as the 33rd successor of Saint Peter.
The Second Ecumenical Council: [[Constantinople I|First Council of Constantinople]] 381
The Second Ecumenical Council: [[Constantinople I|First Council of Constantinople]] 381