| Returning to Italy, he worked with St. Hilary, bishop of Poitiers, France, in opposing Arianism. |
| Having concerned himself with Arianism and Monophysitism, the matter of the Donatist controversy was brought to his attention by his friend Robert Williams. |
| Opposing all forms of Arianism, which denied Christ's divinity, Athanasius taught that Christ the Son, and likewise the Holy Spirit, were of the same being as God the Father. |
| The council boldly claimed this as the faith of the Church and named Arianism as a heresy and Arians as heretics. |
| Newman's foray into Monophysitism, still operating from the hermeneutic established in his work on Arianism, helped to pave the way for his conversion. |
| In the meantime, the main heresy condemned at the council, Arianism, became ascendant and almost triumphed over orthodoxy. |
