First Council of Nicaea, (325), the first ecumenical council of the Christian church, meeting in ancient Nicaea (now İznik, Turkey). It was called by the emperor Constantine I, an unbaptized catechumen, who presided over the opening session and took part in the discussions.
The Council of Nicaea convened to decide the guiding rules of the church - and to resolve the questions posed by Arian theology. A deacon named Athanasius set himself against Arius and succeeded in getting his teachings declared heresy.
the Council of Nicea
What happened at the council of Nicaea? Was the Trinity made up there? Was the divinity of Jesus declared there for the first time? This video answers these question?
The Council of Nicaea. This page from the History Channel offers a neat explanation of the Council, the reasons it was held, the conflicts within it and a brief explanation of the Nicene Creed.
First Council of Nicaea. An article that nicely summarises the conflicts that brought about the Council, including the Bible quotes referred to by the different sides.
What was the Council of Nicaea? This article lists important figures involved in the Council, as well as describing the factions involved, and their views.