Compiled from First seven Ecumenical Councils and related linked articles from Wikipedia
First Council: First Nicaea 325
(Trinity, first Nicene Creed)
Emperor Constantine convened this council to settle a controversial issue, the relation between Jesus Christ and God the Father. The council drew up a creed, the original Nicene Creed, which received nearly unanimous support. The council’s description of “God’s only-begotten Son”, Jesus Christ, as of the same substance with God the Father became a touchstone of Christian Trinitarianism. The Council was opposed by the Arians, and Constantine tried to reconcile Arius, after whom Arianism is named, with the Church.
The council also addressed the issue of dating Easter (see Quartodecimanism andEaster controversy), recognised the right of the see of Alexandria to jurisdiction outside of its own province (by analogy with the jurisdiction exercised by Rome) and the prerogatives of the churches in Antioch and the other provinces and approved the custom by which Jerusalem was honoured, but without the metropolitan dignity. · · · →