Athanasius of Alexandria (Greek: Ἀθανάσιος, Athanásios) (c. 293 – 2 May 373), also given the titles Athanasius the Great, Pope Athanasius I of Alexandria, and Athanasius the Apostolic, was a Christian theologian, bishop of Alexandria, Church Father, and a noted Egyptian leader of the fourth century. He is best remembered for his role in the conflict with Arius and Arianism. At the First Council of Nicaea, Athanasius argued against Arius and his doctrine that Christ is of a distinct substance from the Father.