The First Council of Nicaea, convened by the Roman Emperor Constantine I in AD 325, was the first ecumenical council in the history of the Church. This ecumenical council was the first effort to attain consensus in the church through an assembly representing all Christendom. Hosius of Corduba may have presided over its deliberations.

The council was primarily concerned with the Arian controversy, which was a dispute over the nature of the Son of God. Arius, a priest from Alexandria, had argued that the Son was created by the Father and was therefore not of the same substance as the Father. This view was rejected by the council, which affirmed that the Son was "begotten, not made, being of one substance with the Father." This statement of faith, known as the Nicene Creed, is still used by many Christian churches today.

The council also dealt with a number of other issues, including the date of Easter, the ordination of bishops, and the treatment of lapsed Christians. It is considered to be one of the most important events in the history of the Christian Church.
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