The Council of Nicaea did assert that Christ was of the same substance as God, which laid the groundwork for later Trinitarian theology.

The Encyclopædia Britannica relates: “Constantine himself presided, actively guiding the discussions, and personally proposed . . . the crucial formula expressing the relation of Christ to God in the creed issued by the council, ‘of one substance with the Father’ . . . Overawed by the emperor, the bishops, with two exceptions only, signed the creed, many of them much against their inclination.”